Postpartum And Interpregnancy Care - USMLE Step 3

SECTION 1

Historical Context & Motivation

For centuries, the postpartum period was regarded primarily as a time of "confinement" during which women rested and recovered from childbirth with minimal medical oversight. Maternal mortality remained devastatingly high well into the nineteenth century, largely attributable to puerperal sepsis, hemorrhage, and eclampsia. The notion that structured medical care during the weeks following delivery could significantly reduce morbidity and mortality emerged only gradually, shaped by landmark discoveries in antisepsis, obstetric anesthesia, and reproductive physiology. Today, the postpartum and interpregnancy interval is recognized as a critical window for maternal health surveillance, chronic disease management, and contraceptive counseling — a paradigm shift that has dramatically improved outcomes for mothers and newborns alike.

1847 • Semmelweis and Hand Hygiene

Ignaz Semmelweis demonstrated that handwashing with chlorinated lime drastically reduced puerperal fever in maternity wards, laying the foundation for infection prevention in the postpartum setting.

1930s • Emergence of Prenatal and Postnatal Care Models

Organized prenatal clinics expanded to include scheduled postpartum follow-up visits, recognizing that the first six weeks after delivery required structured medical surveillance for complications such as hemorrhage, infection, and mood disorders.

1960s • Modern Contraception and Birth Spacing

The introduction of oral contraceptive pills and intrauterine devices provided reliable means of birth spacing, transforming interpregnancy care from passive observation to active reproductive planning.

2006 • WHO Interpregnancy Interval Guidelines

The World Health Organization formally recommended an interpregnancy interval of at least 24 months following a live birth and 6 months after miscarriage, based on evidence linking short intervals to adverse perinatal outcomes.

2018 • ACOG Fourth Trimester Initiative

The American College of Obstetricians and Gynecologists redefined postpartum care as an ongoing process culminating at 12 weeks, with an initial contact within the first 3 weeks and a comprehensive visit no later than 12 weeks postpartum.

Despite these advances, maternal morbidity and mortality remain unacceptably high in many populations, disproportionately affecting individuals of lower socioeconomic status and those from racial and ethnic minority groups. The central question that drives modern postpartum and interpregnancy care is: How can we transform a single postpartum visit into a comprehensive, longitudinal care model that addresses the full spectrum of physical, psychological, and reproductive health needs?

SECTION 2

Core Principles & Definitions

Postpartum care encompasses all clinical interventions and surveillance measures that span from the moment of placental delivery through the first 12 weeks following childbirth — commonly referred to as the fourth trimester. The interpregnancy interval is defined as the time between delivery of one pregnancy and conception of the next, and optimizing this interval is essential for reducing risks of preterm birth, low birth weight, small-for-gestational-age neonates, and maternal complications. These two domains — the acute postpartum period and the broader interpregnancy interval — together form a continuum of care that modern obstetric practice seeks to integrate seamlessly.

Physiologic Involution

The process by which the uterus returns to its pre-pregnant state over approximately 6 weeks, involving contraction of myometrial fibers and regeneration of the endometrium. Monitoring involution helps detect retained products of conception and endometritis.

Postpartum Hemorrhage Surveillance

Defined as cumulative blood loss ≥ 1000 mL or signs/symptoms of hypovolemia within 24 hours (primary) or between 24 hours and 12 weeks (secondary) after birth. Uterine atony remains the leading cause.

Lactation and Breastfeeding Support

Breast milk production follows a hormonally driven sequence of colostrum, transitional milk, and mature milk. Breastfeeding is associated with reduced postpartum hemorrhage, faster uterine involution, and long-term reduction in maternal cardiovascular risk.

Postpartum Mood Disorders

A spectrum ranging from postpartum blues (up to 80% of deliveries) to postpartum depression (10–20%) and postpartum psychosis (0.1–0.2%). Validated screening tools such as the Edinburgh Postnatal Depression Scale (EPDS) should be administered at every postpartum contact.

Interpregnancy Optimization

Ensuring an adequate interval between pregnancies allows for nutritional repletion (particularly folate and iron), resolution of gestational complications (e.g., gestational diabetes or preeclampsia), and appropriate contraceptive counseling to prevent unintended pregnancies.

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KEY TAKEAWAY

Think of the postpartum period as a controlled systems reboot — the cardiovascular system must offload excess blood volume, the endocrine system must recalibrate from a placenta-driven state, the reproductive organs must involute, and the immune system must shift back toward its baseline. Just as a computer undergoing a major operating-system update is vulnerable to errors if interrupted prematurely, a woman's body during the postpartum window is uniquely susceptible to complications if not properly monitored and supported through this transition.

SECTION 3

Visual Explanation — The Postpartum Care Timeline

This diagram illustrates the ACOG-recommended postpartum care timeline from delivery through 12 weeks postpartum. The upper row traces five key phases — immediate, early postpartum, initial contact (within 3 weeks), mid-postpartum, and the comprehensive visit (by 12 weeks). The lower panels detail physiologic involution milestones on the left and critical red-flag warning signs on the right.

The diagram above emphasizes the ACOG paradigm shift from a single 6-week postpartum visit to a process-oriented approach. The initial contact within 3 weeks is particularly critical for patients at risk for postpartum preeclampsia, wound complications, or mood disorders. Note that ovulation may return as early as 25 days postpartum in non-breastfeeding women — underscoring why contraceptive counseling should begin before hospital discharge and be finalized at the comprehensive visit. Each phase in this timeline targets specific physiologic transitions and clinical risks, reinforcing the principle that effective postpartum care requires multiple touchpoints rather than a single encounter.

SECTION 4

Mechanisms of Postpartum Physiology

Cardiovascular Adaptation

During pregnancy, maternal blood volume increases by approximately 40–50% to accommodate uteroplacental perfusion. Following delivery, the autotransfusion of blood from the contracted uterus into the systemic circulation increases cardiac output transiently by 60–80% above prelabor values. This hemodynamic surge places women with underlying cardiac disease at heightened risk during the immediate postpartum hours. Over the subsequent 6–8 weeks, plasma volume, cardiac output, and systemic vascular resistance gradually normalize to prepregnancy baselines. Clinicians must monitor blood pressure closely during this window, as postpartum preeclampsia can develop de novo or worsen in patients who had antepartum hypertensive disease.

Endocrine Transition

The abrupt withdrawal of placental estrogen and progesterone after delivery is the central endocrine event of the postpartum period. This hormonal shift triggers lactogenesis II (the onset of copious milk production, typically 30–40 hours postpartum), mediated by the release of prolactin from the anterior pituitary that was previously suppressed by placental progesterone. Concomitantly, the hypothalamic-pituitary-ovarian (HPO) axis begins its gradual recovery, with the timing of ovulation return dependent largely on breastfeeding frequency and exclusivity. In exclusively breastfeeding women, the lactational amenorrhea method (LAM) provides up to 98% contraceptive efficacy during the first 6 months, contingent upon three criteria: amenorrhea, exclusive breastfeeding, and the infant being younger than 6 months.

Uterine Involution and Lochia

Immediately after delivery, the uterine fundus is palpable at the level of the umbilicus. It descends approximately 1 cm per day, becoming non-palpable above the pubic symphysis by 2 weeks postpartum. Lochia follows a predictable color progression: lochia rubra (red, days 1–3), lochia serosa (pinkish-brown, days 4–10), and lochia alba (whitish-yellow, days 10–28). A return to rubra-like bleeding after the initial resolution may signal retained products of conception, endometritis, or subinvolution of the placental site, each requiring prompt evaluation.

Immunologic and Coagulation Changes

The pregnancy-associated hypercoagulable state persists for approximately 6–12 weeks postpartum, peaking in the first 1–2 weeks. Levels of fibrinogen, factor VIII, and von Willebrand factor remain elevated, while physiologic protein S deficiency gradually corrects. This period carries the highest per-day risk of venous thromboembolism (VTE) in a woman's life. Risk stratification using tools such as the Padua or Caprini score guides decisions about pharmacologic thromboprophylaxis, particularly after cesarean delivery.

SECTION 5

Interpregnancy Interval — Evidence and Classification

This bar graph demonstrates the dose-response relationship between interpregnancy interval length and the relative risk of adverse perinatal outcomes (composite of preterm birth, low birth weight, and small-for-gestational-age). An interval of less than 6 months (red bar) carries approximately 2.7× the risk compared to the reference interval of ≥ 24 months (cyan bar). The optimal zone (green) begins at 18–23 months.

Interval Category	Duration	Associated Risks	Recommended Action
Very Short	< 6 months	Preterm birth (OR 2.7), uterine rupture in TOLAC, maternal nutritional depletion, anemia	Strongly counsel delay; ensure effective long-acting reversible contraception (LARC)
Short	6–17 months	Elevated preterm birth risk (OR 1.3–1.8), SGA, potential placental insufficiency	Counsel on benefits of longer interval; replete folate, iron, and vitamin D stores
Optimal	18–59 months	Lowest composite risk for maternal and neonatal adverse outcomes	Support family planning goals; maintain preconception care
Long	> 59 months	Slightly increased preeclampsia risk (approaches nulliparous rates), stillbirth	Treat as semi-primiparous; intensify antenatal surveillance

Classification of interpregnancy intervals and clinical implications

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CLINICAL PEARL

For patients with a prior cesarean delivery, an interpregnancy interval of less than 18 months is associated with a significantly increased risk of uterine rupture during trial of labor after cesarean (TOLAC). This interval should be explicitly discussed when counseling about mode of delivery in a subsequent pregnancy.

SECTION 6

Worked Example — Clinical Vignette

A 32-year-old G3P3 woman presents for her comprehensive postpartum visit at 8 weeks following an uncomplicated vaginal delivery. Her pregnancy was complicated by gestational diabetes mellitus (GDM) managed with diet and metformin. She is exclusively breastfeeding and reports feeling "overwhelmed and tearful" most days for the past 4 weeks. She denies suicidal ideation. Her vitals are blood pressure 128/82 mmHg, heart rate 76 bpm, BMI 31 kg/m². She asks about contraception and wants to know when she can safely attempt another pregnancy.

Comprehensive Postpartum Visit Management

1
Step 1 — Screen for Postpartum Depression

Administer the Edinburgh Postnatal Depression Scale (EPDS). A score ≥ 10 suggests possible postpartum depression warranting further evaluation. Given her symptoms of persistent tearfulness and feelings of being overwhelmed for 4 weeks — exceeding the typical 2-week duration of postpartum blues — clinical suspicion for postpartum depression is high. If EPDS ≥ 13, consider immediate referral and/or initiation of an SSRI (e.g., sertraline, which is compatible with breastfeeding).

EPDS screening performed → Score 14 → Initiate sertraline 50 mg daily + referral for therapy
2
Step 2 — Evaluate for Persistent Gestational Diabetes

Per ADA and ACOG guidelines, patients with GDM should undergo a 75-gram oral glucose tolerance test (OGTT) at 4–12 weeks postpartum to screen for persistent glucose intolerance or type 2 diabetes. Fasting glucose ≥ 126 mg/dL or 2-hour value ≥ 200 mg/dL confirms diabetes. Impaired values (fasting 100–125 or 2-hour 140–199) indicate prediabetes requiring lifestyle intervention and annual HbA1c monitoring.

Order 75-g OGTT → Fasting glucose 108 mg/dL → Prediabetes diagnosed → Counsel on weight management, continue metformin consideration, annual screening
3
Step 3 — Blood Pressure Assessment and Cardiovascular Risk

Her BP of 128/82 is in the elevated/stage 1 hypertension range. Combined with her history of GDM and BMI of 31, she carries significantly elevated long-term cardiovascular risk. GDM confers a 7-fold increased risk of developing type 2 diabetes and a 2-fold increased risk of cardiovascular disease over 10 years. Counsel on lifestyle modification, weight management, and ensure follow-up with a primary care provider.

BP elevated → No antihypertensive yet → Recheck in 2 weeks → Establish PCP for long-term cardiovascular surveillance
4
Step 4 — Contraceptive Counseling

Given her desire for future pregnancy but need for interpregnancy optimization, discuss long-acting reversible contraception (LARC) as a first-line option. The levonorgestrel IUD and etonogestrel implant are safe during breastfeeding. Combined hormonal methods should generally be avoided before 4–6 weeks postpartum in breastfeeding women due to theoretical effects on milk supply. Copper IUD is also an option. LAM is currently providing protection but will be unreliable once supplemental feeds are introduced or menstruation returns.

Patient elects levonorgestrel 52-mg IUD → Placed today → Plan for 18–24 month interpregnancy interval
5
Step 5 — Interpregnancy Planning

Counsel that an optimal interpregnancy interval of at least 18–24 months following a live birth allows resolution of her prediabetes risk, weight optimization, folate and iron repletion, and stable mental health before attempting another pregnancy. Initiate daily folic acid 400–800 mcg now for preconception planning. Schedule a preconception visit 3–6 months before planned conception that should include HbA1c, fasting glucose, BMI reassessment, and medication review.

Interpregnancy care plan established → Folic acid started → Transition to PCP → Preconception visit in ~18 months

SECTION 7

Postpartum Contraceptive Options — Comparison

Contraceptive counseling is a cornerstone of both postpartum and interpregnancy care, as nearly half of pregnancies in the United States are unintended, and short interpregnancy intervals disproportionately result from gaps in contraceptive access. The table below compares commonly used methods with attention to timing of initiation, breastfeeding compatibility, and typical-use efficacy — factors frequently tested on USMLE Step 3.

Method	Earliest Initiation	Breastfeeding Safe	Typical-Use Failure Rate	Key Considerations
Copper IUD	Immediate postplacental or ≥ 4 weeks	Yes	0.8%	Higher expulsion rate with immediate placement; non-hormonal
LNG-IUD (52 mg)	Immediate postplacental or ≥ 4 weeks	Yes	0.2%	Reduces menstrual bleeding; highest LARC efficacy
Etonogestrel Implant	Immediately postpartum	Yes	0.05%	Most effective reversible method; 3-year duration
DMPA Injection	Immediately postpartum	Yes	6%	Weight gain, delayed return to fertility (~10 months)
Combined OCP/Patch/Ring	≥ 4–6 weeks (non-BF); ≥ 6 weeks (BF)	Caution in BF < 6 weeks	9%	Avoid in first 21 days due to VTE risk; may reduce milk supply
Progestin-Only Pill	Immediately postpartum	Yes	9%	Requires strict daily timing; alternative to CHC in breastfeeding
Lactational Amenorrhea (LAM)	From delivery	Yes (is breastfeeding)	2% (if criteria met)	Requires exclusive BF, amenorrhea, infant < 6 months

Postpartum contraceptive methods comparison — timing, safety, and efficacy

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KEY TAKEAWAY

Think of LARC methods as the "set it and forget it" tier of contraception — analogous to automated systems in engineering that run continuously without requiring daily user input. Just as an automated climate control system outperforms manual thermostat adjustment in maintaining stable temperatures, LARC devices (IUDs and implants) dramatically outperform user-dependent methods in real-world effectiveness because they remove the variable of daily adherence. This is especially important postpartum, when sleep deprivation and newborn care demands make consistent pill-taking challenging.

SECTION 8

Postpartum Complications and Advanced Considerations

While the majority of postpartum recoveries proceed without incident, a subset of complications carries significant morbidity and mortality risk. Recognizing these conditions early — and understanding how they interface with interpregnancy planning — is a high-yield topic for USMLE Step 3. The table below juxtaposes common postpartum complications with their advanced, less-frequent counterparts, highlighting the continuum from acute management to long-term reproductive implications.

Common Complication	Presentation & Management	Advanced / Severe Counterpart	Interpregnancy Implications
Postpartum Blues	Transient mood lability, tearfulness in first 2 weeks; supportive care	Postpartum Psychosis — Hallucinations, delusions, confusion (onset days 3–14); psychiatric emergency requiring hospitalization	Recurrence risk 30–50% in subsequent pregnancies; preconception psychiatric planning essential
Primary PPH (atony)	Uterine massage, uterotonics (oxytocin, methylergonovine, carboprost, misoprostol)	Placenta Accreta Spectrum — Morbidly adherent placenta requiring hysterectomy in severe cases	Accreta risk increases with each prior cesarean; counsel re: planned delivery at tertiary center
Endometritis	Fever, uterine tenderness, foul lochia; broad-spectrum antibiotics (clindamycin + gentamicin)	Septic Pelvic Thrombophlebitis — Persistent fever despite adequate antibiotics; consider heparin anticoagulation	Evaluate for Asherman syndrome if future infertility; ensure adequate uterine healing before conception
Gestational HTN / Preeclampsia	BP monitoring for 72 hrs postpartum; MgSO₄ for severe features; BP should normalize by 12 weeks	Peripartum Cardiomyopathy — EF < 45% developing in last month of pregnancy through 5 months postpartum	Preeclampsia doubles long-term CVD risk; cardiomyopathy may contraindicate future pregnancy if EF does not recover

Common vs. advanced postpartum complications and their interpregnancy relevance

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HIGH-YIELD FOR STEP 3

Postpartum preeclampsia can present de novo up to 6 weeks after delivery. Any patient presenting to the emergency department with severe headache, visual changes, or new hypertension in the postpartum period should have preeclampsia on the differential — even if her antepartum course was uncomplicated. This is a frequently tested scenario on board examinations.

Looking forward, the field is moving toward precision-based postpartum risk stratification that integrates genomic, metabolomic, and clinical data to identify high-risk individuals before complications manifest. Biomarkers such as sFlt-1/PlGF ratios, which currently guide antepartum preeclampsia management, are being studied in the postpartum period for their predictive value in guiding surveillance intensity and long-term cardiovascular risk counseling.

SECTION 9

Practice Problems

Question 1: CONCEPTUAL

A healthy 28-year-old primiparous woman who delivered vaginally 3 days ago asks why she needs a follow-up visit within 3 weeks instead of waiting until the traditional 6-week postpartum visit. Which of the following best explains the rationale for the ACOG-recommended early postpartum contact?

Show answer

The ACOG 2018 guidelines redefined postpartum care as an ongoing process rather than a single event. The initial contact within the first 3 weeks allows clinicians to screen for postpartum mood disorders at a time when postpartum depression symptoms typically become distinguishable from postpartum blues (which resolve by 2 weeks), evaluate wound healing or perineal recovery, assess blood pressure to detect de novo or worsening postpartum preeclampsia, and initiate breastfeeding support during the critical period of lactation establishment. Delaying all assessment to 6 weeks misses a window during which many serious complications — including severe depression, wound infections, and hypertensive emergencies — have their peak incidence.

Question 2: BASIC CALCULATION

A woman delivered a live infant on January 15, 2023. Her obstetrician advises an interpregnancy interval of at least 18 months. What is the earliest date she should conceive her next pregnancy, and what is the earliest recommended date for a subsequent delivery at term (40 weeks)?

Show answer

The interpregnancy interval is measured from delivery to the next conception. Starting from January 15, 2023, adding 18 months yields a earliest conception date of approximately July 15, 2024. A full-term delivery at 40 weeks (280 days, approximately 9 months and 7 days) from July 15, 2024 would place the earliest expected delivery date around April 22, 2025. This calculation underscores the practical importance of effective contraception for the 18 months following delivery, as even a single missed cycle of a short-acting method could result in a suboptimal interpregnancy interval.

Question 3: INTERMEDIATE

A 35-year-old G2P2 woman at her 6-week postpartum visit reports exclusive breastfeeding, amenorrhea since delivery, and wishes to rely on the lactational amenorrhea method (LAM) for contraception. She plans to return to work at 12 weeks and will pump breast milk during the day while her infant receives formula supplementation. When should you recommend she transition to another contraceptive method, and which option would you prioritize?

Show answer

LAM requires three concurrent criteria: exclusive breastfeeding (no supplemental feeds), amenorrhea, and infant age less than 6 months. Once any criterion fails, efficacy drops significantly. In this case, the introduction of formula supplementation at 12 weeks will invalidate the exclusivity criterion, necessitating transition to another method before that time. Given that she is breastfeeding, progestin-only or non-hormonal methods are preferred. A LARC method such as the levonorgestrel IUD or etonogestrel implant would be ideal, as it provides superior typical-use efficacy without reliance on daily adherence — particularly important for a working mother. The IUD or implant should be placed at or before the 12-week comprehensive visit to ensure seamless contraceptive coverage.

Question 4: APPLIED

A 30-year-old G3P3 woman with a history of two prior cesarean deliveries presents at her 8-week postpartum visit after her third cesarean delivery. She had preeclampsia with severe features in this pregnancy requiring magnesium sulfate and early-term delivery at 36 weeks. She developed gestational diabetes requiring insulin in the third trimester. Her postpartum 75-g OGTT shows fasting glucose of 118 mg/dL and 2-hour glucose of 162 mg/dL. She wishes to have one more child. Outline a comprehensive interpregnancy care plan addressing her specific risk factors.

Show answer

This patient has multiple compounding risk factors: three prior cesarean deliveries (elevated placenta accreta spectrum risk, approximately 3% with 3 cesareans), history of severe preeclampsia (2× long-term cardiovascular disease risk and 15–25% recurrence risk), and now confirmed prediabetes (fasting glucose 118, 2-hour 162 — impaired fasting glucose and impaired glucose tolerance). The interpregnancy plan should include: (1) LARC placement now to ensure an interval of at least 18–24 months; (2) intensive lifestyle modification targeting weight loss (even 5–7% body weight reduction significantly reduces diabetes conversion), regular exercise, and Mediterranean-style dietary pattern; (3) metformin consideration for diabetes prevention if lifestyle alone insufficient; (4) low-dose aspirin 81 mg daily starting at 12 weeks in the next pregnancy for preeclampsia prophylaxis (USPSTF recommendation); (5) early prenatal ultrasound in the next pregnancy to evaluate for placenta previa/accreta given three prior uterine scars; (6) establishment of primary care for cardiovascular risk monitoring including annual fasting glucose/HbA1c, lipid panel, and blood pressure monitoring; and (7) preconception counseling regarding the cumulative cesarean delivery risks, including possible planned cesarean hysterectomy if accreta is diagnosed.

Question 5: CRITICAL THINKING

Discuss the ethical and clinical tensions that arise when a patient with peripartum cardiomyopathy (EF 30% at 3 months postpartum) expresses a strong desire for future pregnancy. How should the interpregnancy care team approach this situation, and what factors inform the recommendation regarding subsequent pregnancy safety?

Show answer

Peripartum cardiomyopathy (PPCM) presents a complex intersection of patient autonomy, reproductive rights, and medical risk. With an EF of 30% at 3 months, the patient has significant systolic dysfunction. Key factors informing counseling include: (1) Recovery trajectory — approximately 50% of PPCM patients recover EF to ≥ 50% within 6 months; however, persistent dysfunction (EF < 50%) at 6 months is a strong negative prognostic indicator. (2) Mortality risk — subsequent pregnancy in women with persistent PPCM carries maternal mortality rates estimated at 25–50% and further EF decline in up to 50% of cases. Even women with recovered EF face a 20–30% risk of recurrent LV dysfunction. (3) The care team should include a maternal-fetal medicine specialist and a cardiologist experienced in cardio-obstetrics, and counseling should use shared decision-making frameworks that honestly present the data while respecting the patient's values. (4) If the patient chooses to proceed after full informed consent, preconception optimization includes achieving and maintaining EF recovery (ideally ≥ 50%) for at least 12 months before conception, transitioning from ACE inhibitors to pregnancy-safe antihypertensives, serial echocardiography throughout pregnancy, and delivery planning at a tertiary center with multidisciplinary support. (5) Reliable contraception — ideally a progestin IUD or implant (combined estrogens are relatively contraindicated in heart failure) — should be initiated immediately, and the conversation should be revisited at serial follow-up as her cardiac status evolves.

SUMMARY

Postpartum and Interpregnancy Care — Key Concepts Review

Summary

The fourth trimester spans from delivery through 12 weeks postpartum and requires a process-oriented approach with at least two clinical contacts: an initial assessment within 3 weeks and a comprehensive visit by 12 weeks. Key surveillance targets include postpartum hemorrhage (uterine atony as the leading cause), postpartum mood disorders (screened with the EPDS), venous thromboembolism (hypercoagulability persists 6–12 weeks), postpartum preeclampsia (can present de novo up to 6 weeks), and progression from gestational diabetes to type 2 diabetes (75-g OGTT at 4–12 weeks postpartum).

The interpregnancy interval — defined as the time from delivery to next conception — is optimally 18–24 months or longer after a live birth and at least 6 months after miscarriage. Intervals shorter than 6 months carry the highest composite risk for preterm birth, low birth weight, and SGA. LARC methods (IUDs and implants) represent first-line postpartum contraception due to superior efficacy independent of user adherence. Lactational amenorrhea provides reliable protection only when all three criteria are met (exclusive breastfeeding, amenorrhea, infant < 6 months). Transition to primary care for long-term cardiovascular risk management is essential for patients with histories of preeclampsia, GDM, or peripartum cardiomyopathy — conditions that serve as sex-specific risk factors for future heart disease.