{
  "slug": "infertility-couple",
  "question": "What are the odds of experiencing infertility when trying to conceive?",
  "category": "health",
  "tags": [
    "relationships"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Most couples approaching conception assume it will happen within a few months. Surveys consistently find low-to-moderate fertility awareness among reproductive-age adults: university students overestimate the length of the fertile window, underestimate the effect of age, and fewer than half of people surveyed regard infertility as a medical condition. A 2018 systematic review of fertility-awareness studies found that participants across multiple countries reported \"inadequate fertility awareness concerning fertility, infertility risk factors, and consequences of delaying childbearing.\" The default mental model is that conception is easy and infertility is rare — a significant underestimate of the actual prevalence.\n",
    "rough_estimate": "Most couples assume conception will happen quickly; fewer than half consider infertility a medical condition",
    "kind": "survey",
    "survey_source": {
      "title": "What do people know about fertility? A systematic review on fertility awareness and its associated factors",
      "publisher": "BMC Public Health (Pedro et al.)",
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC6055749/",
      "year": 2018
    }
  },
  "native": {
    "display": "~1 in 6 couples (17.5% lifetime prevalence)",
    "numerator": 175,
    "denominator": 1000,
    "unit": "lifetime prevalence",
    "population": "reproductive-age couples globally, 12-month definition"
  },
  "normalized": {
    "lifetime_us_adult": 0.175,
    "display": "~17.5% lifetime prevalence (1 in ~6 couples)",
    "log_value": -0.76,
    "assumptions": "Uses the WHO 2023 pooled lifetime prevalence estimate of 17.5% for 12-month infertility, drawn from Cox et al. (2022) systematic review of 133 studies spanning 1990-2021. The figure represents the proportion of reproductive-age people who have ever experienced 12 months of unprotected intercourse without conceiving. Period prevalence (at any given time) is lower at 12.6%. The WHO report found limited variation by income level: 17.8% in high-income countries vs 16.5% in low- and middle-income countries. US-specific data from the 2015-2019 NSFG gives 8.7% infertility among married women 15-44 using a stricter current-status definition, and 13.4% impaired fecundity among all women 15-49. The WHO lifetime figure of 17.5% is used as the headline because it captures the cumulative probability a couple will face this outcome across their reproductive years.\n",
    "uncertainty": {
      "low": 0.126,
      "high": 0.225
    },
    "scope": "subgroup_lifetime"
  },
  "sources": [
    {
      "url": "https://academic.oup.com/hropen/article/2022/4/hoac051/6825316",
      "title": "Infertility prevalence and the methods of estimation from 1990 to 2021: a systematic review and meta-analysis",
      "publisher": "Human Reproduction Open (Cox et al.)",
      "source_type": "peer_reviewed",
      "statistic": "Pooled lifetime prevalence of 12-month infertility: 17.5%; period prevalence: 12.6%",
      "excerpt": "\"Pooled estimates of lifetime and period prevalence of 12-month infertility were 17.5% and 12.6%, respectively, but this varied by study population and methodological approach.\"\n",
      "source_date": "2022-11-12",
      "source_accessed": "2026-04-19",
      "archive_url": "http://web.archive.org/web/20240730075231/https://academic.oup.com/hropen/article/2022/4/hoac051/6825316",
      "calculation_notes": "Systematic review and meta-analysis of 133 studies from 1990-2021. This is the evidence base underlying the WHO 2023 infertility report. Lifetime prevalence 17.5% (1 in ~6) is used as the native estimate. Period prevalence 12.6% anchors the uncertainty low bound. Highest regional lifetime prevalence was 23.2% (Western Pacific), lowest 10.7% (Eastern Mediterranean). The denominator definition matters: period estimates among couples actively trying ranged from 9.4-32.0%.\n",
      "independence_note": "This is the primary meta-analysis underpinning the WHO 2023 report. It synthesises data from 133 independent studies across all WHO regions.\n"
    },
    {
      "url": "https://www.who.int/news/item/04-04-2023-1-in-6-people-globally-affected-by-infertility",
      "title": "1 in 6 people globally affected by infertility: WHO",
      "publisher": "World Health Organization",
      "source_type": "govt_report",
      "statistic": "Around 17.5% of the adult population — roughly 1 in 6 worldwide — experience infertility",
      "excerpt": "\"Around 17.5% of the adult population – roughly 1 in 6 worldwide – experience infertility, showing the urgent need to increase access to affordable, high-quality fertility care for those in need.\"\n",
      "source_date": "2023-04-04",
      "source_accessed": "2026-04-19",
      "archive_url": "https://web.archive.org/web/20260505060129/https://www.who.int/news/item/04-04-2023-1-in-6-people-globally-affected-by-infertility",
      "calculation_notes": "WHO policy report summarising the Cox et al. 2022 systematic review. Confirms the 17.5% lifetime prevalence figure and notes limited variation between high-income (17.8%) and low- and middle-income countries (16.5%). Used as corroborating governmental source for the headline number.\n",
      "independence_note": "Dependent on the Cox et al. systematic review — this is the policy translation of the same data, not an independent data source.\n"
    },
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/38722687/",
      "title": "Infertility and Impaired Fecundity in Women and Men in the United States, 2015-2019",
      "publisher": "National Health Statistics Reports, No. 202 (Chandra & Copen)",
      "source_type": "govt_report",
      "statistic": "8.7% of married women aged 15-44 were infertile; 13.4% of all women 15-49 had impaired fecundity",
      "excerpt": "\"The percentage of married women ages 15-44 who were infertile rose from 2011-2015 (6.7%) to 2015-2019 (8.7%). Among all women, 13.4% of women ages 15-49 and 15.4% of women ages 25-49 had impaired fecundity in 2015-2019.\"\n",
      "source_date": "2024-04-24",
      "source_accessed": "2026-04-19",
      "archive_url": "http://web.archive.org/web/20260420042130/https://pubmed.ncbi.nlm.nih.gov/38722687/",
      "calculation_notes": "US-specific data from the National Survey of Family Growth (NSFG), 2015-2019 cycle. Uses a stricter current-status definition: married women currently in 12+ months of unprotected intercourse without conception. The 8.7% married-women figure is lower than the WHO lifetime figure because it captures point-in-time prevalence among a specific subgroup, not cumulative lifetime experience. Impaired fecundity (13.4%) is a broader measure including difficulty carrying to term.\n",
      "independence_note": "Entirely independent US household survey data (NSFG), separate from the WHO meta-analysis which pooled international studies.\n"
    },
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/24559617/",
      "title": "Female age-related fertility decline. Committee Opinion No. 589",
      "publisher": "American College of Obstetricians and Gynecologists",
      "source_type": "reputable_reference",
      "statistic": "Fecundity decreases gradually but significantly beginning at age 32 and more rapidly after age 37",
      "excerpt": "\"The fecundity of women decreases gradually but significantly beginning approximately at age 32 years and decreases more rapidly after age 37 years.\"\n",
      "source_date": "2014-03-01",
      "source_accessed": "2026-04-19",
      "archive_url": "http://web.archive.org/web/20260420042153/https://pubmed.ncbi.nlm.nih.gov/24559617/",
      "calculation_notes": "ACOG Committee Opinion providing the clinical framework for age-related fertility decline. Sourced the age-specific conception probabilities used in the regional breakdown: ~85% within 12 months before age 30, ~75% at 30, ~66% at 35, ~44% at 40. Updated in 2025 by a newer Committee Statement but the underlying age curve remains unchanged.\n",
      "independence_note": "Clinical practice guideline synthesising multiple reproductive biology studies. Independent of the WHO meta-analysis and NSFG survey, though drawing from some of the same underlying literature on age and fecundability.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Miscarriage (per recognized pregnancy)",
      "lifetime_us_adult": 0.15
    },
    {
      "label": "Cancer (lifetime, US adult)",
      "lifetime_us_adult": 0.4
    },
    {
      "label": "Divorce (US marriages)",
      "lifetime_us_adult": 0.41
    }
  ],
  "regional_breakdown": [
    {
      "region": "Female age under 30",
      "probability": 0.15,
      "notes": "~85% conceive within 12 months; ~15% meet the 12-month infertility definition"
    },
    {
      "region": "Female age 30",
      "probability": 0.25,
      "notes": "~75% conceive within 12 months; probability of infertility rises to ~25%"
    },
    {
      "region": "Female age 35",
      "probability": 0.34,
      "notes": "~66% conceive within 12 months; ACOG recommends evaluation after 6 months at this age"
    },
    {
      "region": "Female age 38",
      "probability": 0.44,
      "notes": "Accelerating decline; roughly 56% conceive within 12 months"
    },
    {
      "region": "Female age 40",
      "probability": 0.56,
      "notes": "~44% conceive within 12 months; ACOG recommends immediate evaluation"
    },
    {
      "region": "Female age 43+",
      "probability": 0.7,
      "notes": "Fewer than 1 in 3 conceive within 12 months; egg quality and quantity sharply reduced"
    }
  ],
  "personal_factor_multipliers": [
    {
      "factor": "Female age under 30 (baseline)",
      "multiplier": 1,
      "notes": "Reference group; ~15% 12-month infertility rate"
    },
    {
      "factor": "Female age 30-34",
      "multiplier": 1.7,
      "notes": "Gradual decline begins at 32; ~25% fail to conceive within 12 months"
    },
    {
      "factor": "Female age 35-37",
      "multiplier": 2.3,
      "notes": "~34% 12-month infertility; ACOG shifts to 6-month evaluation window"
    },
    {
      "factor": "Female age 38-39",
      "multiplier": 2.9,
      "notes": "~44% 12-month infertility; rapid decline accelerates"
    },
    {
      "factor": "Female age 40+",
      "multiplier": 3.7,
      "notes": "~56% 12-month infertility; per-cycle fecundability drops to ~5-10%"
    },
    {
      "factor": "PCOS diagnosis",
      "multiplier": 2,
      "notes": "Polycystic ovary syndrome is the most common ovulatory disorder; affects ~6-12% of reproductive-age women"
    },
    {
      "factor": "Endometriosis diagnosis",
      "multiplier": 2.5,
      "notes": "30-50% of women with endometriosis experience infertility"
    },
    {
      "factor": "Male factor present",
      "multiplier": 1.5,
      "notes": "Male factor solely responsible in ~20% of cases, contributory in another 30-40% (AUA/ASRM)"
    },
    {
      "factor": "Prior successful pregnancy",
      "multiplier": 0.6,
      "notes": "Secondary infertility is less common than primary; proven fertility reduces baseline risk"
    },
    {
      "factor": "Current smoker (either partner)",
      "multiplier": 1.6,
      "notes": "Smoking reduces female fecundability and impairs sperm parameters"
    },
    {
      "factor": "BMI over 30 (either partner)",
      "multiplier": 1.4,
      "notes": "Obesity disrupts ovulation and reduces sperm quality; dose-response relationship"
    }
  ],
  "short_label": "Infertility",
  "myth_framing": "underrated",
  "outcome_severity": "moderate_harm",
  "exposure_pattern": "cumulative",
  "outcome_type": "chronic_illness",
  "valence": "negative",
  "caveats": "The headline 17.5% is a lifetime prevalence — the proportion of reproductive-age people who will ever experience 12 months of unprotected intercourse without conceiving. Many of these couples eventually conceive without treatment (subfertility is not sterility). The 12-month clinical definition does not distinguish temporary from permanent infertility. Age-specific figures in the regional breakdown refer to the probability of not conceiving within 12 months at that age; they are not additive across ages. Male factor data are underrepresented in population surveys because most historical studies defined infertility through female respondents only. IVF success rates are not included in the headline probability — they describe treatment outcomes, not population prevalence.\n",
  "quality_score": {
    "d1": 5,
    "d2": 5,
    "d3": 5,
    "d4": 5,
    "d5": 5,
    "d6": 5,
    "d7": 5,
    "d8": 5,
    "avg": 5,
    "scored_by": "claude-code-8d",
    "scored_at": "2026-05-25",
    "methodology_version": "1.2"
  },
  "reviewer": "quality-review-agent",
  "last_reviewed": "2026-04-19",
  "reviewed": true,
  "generated_at": "2026-04-19",
  "image": {
    "alt": "Two overlapping circles in muted tones against a pale background, one slightly incomplete, flat vector illustration."
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  "attribution": "Likelier — https://likelier.app",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "support": "https://buymeacoffee.com/kgluszczyk?via=likelier&utm_content=api-fear-single",
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}