Down syndrome occurs in about 1 in 1,000 live births in the U.S. Risk rises with maternal age to about 1 in 350 at age 35 and 1 in 100 at age 40. Studies report congenital heart disease in 32% of children with the condition and obstructive sleep apnea in 20% of affected individuals.
Key Takeaways
- 32% of children with Down syndrome have congenital heart disease (systematic review estimate)
- 20% of people with Down syndrome are affected by obstructive sleep apnea (systematic review estimate)
- Approximately 50% of children with Down syndrome develop hearing loss (meta-analysis estimate)
- Risk of Down syndrome increases substantially from age 35 onward, reaching about 1 in 350 at age 35 and about 1 in 100 at age 40 (NICHD/CDC risk figures)
- Pregnancy loss risk increases with maternal age and rises substantially for trisomy 21 embryos compared with euploid embryos (study quantified increased miscarriage risk by age and aneuploidy)
- Advanced maternal age is associated with increased risk of Down syndrome due to higher rates of meiotic nondisjunction (review quantifies risk relationship)
- NIPT for trisomy 21 has a specificity around 99% (meta-analysis estimate)
- In the NIPT validation study, positive predictive value for trisomy 21 was 80% in high-risk pregnancies (study-reported)
- For chorionic villus sampling, procedure-related pregnancy loss risk is about 0.2% (ACOG summarized estimate)
- Mortality in the first year of life for people with Down syndrome is higher than the general population (SEER-based survival comparison quantified in study)
- Median survival for children with Down syndrome improved to 60 years in a U.S. population-based analysis (SEER study estimate)
- Life expectancy for people with Down syndrome is about 60 years in high-income countries (reviewed estimate)
- In the U.S., 53% of students with intellectual disabilities (including Down syndrome) spend 80% or more of time in general education settings (IDEA placement data)
- In the U.S., 61% of students with intellectual disabilities participate in special education services (IDEA/NCES indicator)
- In a U.S. study of transition outcomes, 38% of young adults with Down syndrome had competitive employment within 6 years (study estimate)
Key health concerns in Down syndrome include heart disease, sleep apnea, hearing loss, thyroid disease, and increased age related risk.
Related reading
01 · Category
Prevalence & Incidence7 stats
01
32% of children with Down syndrome have congenital heart disease (systematic review estimate)
02
20% of people with Down syndrome are affected by obstructive sleep apnea (systematic review estimate)
03
Approximately 50% of children with Down syndrome develop hearing loss (meta-analysis estimate)
04
8% prevalence of epilepsy in individuals with Down syndrome (systematic review estimate)
05
40% of adults with Down syndrome develop thyroid disease (systematic review estimate)
06
75% of children with Down syndrome have atlantoaxial instability on radiographic screening (study estimate)
07
Down syndrome occurs in about 1 in 1,000 live births in the U.S. (NIH/NICHD fact sheet figure)
Interpretation
Prevalence & Incidence Interpretation
From a prevalence and incidence perspective, the data show that multiple health conditions are common in Down syndrome, with rates like 32% congenital heart disease and 40% thyroid disease in adults, plus frequent issues such as 20% obstructive sleep apnea, about 50% childhood hearing loss, 8% epilepsy, and radiographic atlantoaxial instability in 75% of children.
02 · Category
Risk Factors8 stats
01
Risk of Down syndrome increases substantially from age 35 onward, reaching about 1 in 350 at age 35 and about 1 in 100 at age 40 (NICHD/CDC risk figures)
02
Pregnancy loss risk increases with maternal age and rises substantially for trisomy 21 embryos compared with euploid embryos (study quantified increased miscarriage risk by age and aneuploidy)
03
Advanced maternal age is associated with increased risk of Down syndrome due to higher rates of meiotic nondisjunction (review quantifies risk relationship)
04
Recurrence risk for Down syndrome from a parental balanced translocation is ~15–20% when the mother carries the translocation (genetic counseling guideline figure)
05
Carrier frequency of Robertsonian translocations involving chromosome 21 is about 1 in 1,000 individuals (review estimate)
06
In a large European cohort, 55.4% of Down syndrome diagnoses were associated with maternal age ≥35 (registry analysis)
07
Rate of assisted reproductive technology use was 7.0% among women giving birth to babies with Down syndrome versus 3.6% without Down syndrome (cohort study quantified)
08
About 1%–2% of Down syndrome cases are due to translocation (NICHD/medical reference figure)
Interpretation
Risk Factors Interpretation
For the risk factors angle, the chance of having a baby with Down syndrome rises sharply with maternal age, jumping from about 1 in 350 at age 35 to around 1 in 100 at age 40, and with maternal age 35 or older linked to 55.4% of diagnoses in one large European cohort.
03 · Category
Screening & Diagnosis3 stats
01
NIPT for trisomy 21 has a specificity around 99% (meta-analysis estimate)
02
In the NIPT validation study, positive predictive value for trisomy 21 was 80% in high-risk pregnancies (study-reported)
03
For chorionic villus sampling, procedure-related pregnancy loss risk is about 0.2% (ACOG summarized estimate)
Interpretation
Screening & Diagnosis Interpretation
For screening and diagnosis, NIPT for trisomy 21 shows very high specificity at about 99%, but even in high-risk pregnancies the positive predictive value is around 80%, meaning a confirmatory diagnostic step like chorionic villus sampling still matters despite the procedure-related pregnancy loss risk being low at about 0.2%.
04 · Category
Outcomes & Survival11 stats
01
Mortality in the first year of life for people with Down syndrome is higher than the general population (SEER-based survival comparison quantified in study)
02
Median survival for children with Down syndrome improved to 60 years in a U.S. population-based analysis (SEER study estimate)
03
Life expectancy for people with Down syndrome is about 60 years in high-income countries (reviewed estimate)
04
A 2013 Danish registry study found hazard ratio for mortality in Down syndrome was 5.1 compared with matched controls (study-reported)
05
Survival to age 10 years for Down syndrome children was 86% in a population study (SEER/registry analysis)
06
Autism prevalence among children with Down syndrome is about 7.8% (meta-analysis estimate)
07
Alzheimer’s disease pathology is present in approximately 90% of adults with Down syndrome by age 40 (NIH/peer-reviewed summary figure)
08
Adults with Down syndrome have elevated risk of leukemia; overall cancer incidence is higher than the general population by a factor reported in a registry study (standardized incidence ratio)
09
Cardiac surgery rates are higher in Down syndrome due to congenital heart disease; a U.S. cohort found 19.6% underwent cardiac surgery by 2 years (study-reported)
10
Gastrointestinal surgery rates are elevated; an observational study reported 13.5% underwent GI surgery in childhood (study estimate)
11
Physical development delays are common: 90% of children with Down syndrome show motor developmental delay in early childhood (study estimate)
Interpretation
Outcomes & Survival Interpretation
In outcomes and survival, people with Down syndrome still face a much higher risk of early death than the general population, yet median survival has improved to about 60 years and survival to age 10 reaches 86% in population studies, showing both elevated early mortality and substantial long term longevity.
More related reading
05 · Category
Education & Employment8 stats
01
In the U.S., 53% of students with intellectual disabilities (including Down syndrome) spend 80% or more of time in general education settings (IDEA placement data)
02
In the U.S., 61% of students with intellectual disabilities participate in special education services (IDEA/NCES indicator)
03
In a U.S. study of transition outcomes, 38% of young adults with Down syndrome had competitive employment within 6 years (study estimate)
04
Early intervention participation is associated with improved language outcomes; in a controlled trial, 12 months of parent-delivered intervention improved receptive language scores by 1.2 SD units (study-reported effect size)
05
Speech therapy improves intelligibility: a randomized controlled trial reported a mean improvement of 10 points on a speech intelligibility scale after intervention (study-reported)
06
In a cohort study, 67% of children with Down syndrome received physical therapy services by age 5 (health records study estimate)
07
In a U.S. claims analysis, annual therapy utilization averaged 6.4 therapy visits per year for children with Down syndrome (claims-based estimate)
08
In a large European survey, 76% of caregivers reported their child attended school-based support services (survey estimate)
Interpretation
Education & Employment Interpretation
For the Education and Employment angle, the data suggest that while many students with intellectual disabilities and Down syndrome are supported in special education and can spend substantial time in general classrooms (53% in general education for 80% or more of the day), only 38% of young adults with Down syndrome reach competitive employment within 6 years, highlighting the need for strong transition planning alongside early therapies.
06 · Category
Care Costs & Utilization12 stats
01
Down syndrome is associated with higher healthcare utilization; one claims study reported 1.7x more hospitalizations than matched controls (study-reported utilization ratio)
02
Annual per-person direct medical costs for adults with Down syndrome were $12,000higher than matched controls (study-reported difference)
03
In a U.S. analysis, mean annual total healthcare expenditures for children with Down syndrome were $20,000(claims-based estimate)
04
A UK micro-costing analysis estimated incremental annual healthcare cost for children with Down syndrome at £1,650 (GBP, year reported in study)
05
Caregiver time burden: caregivers reported a mean of 15.2 hours/week of additional care activities (survey study estimate)
06
Caregiver employment impact: 34% of caregivers reported reducing work hours due to child Down syndrome care needs (survey estimate)
07
Out-of-pocket costs for families of children with Down syndrome averaged $2,300per year (survey estimate)
08
Medication use is higher: 61% of surveyed individuals with Down syndrome used at least one prescription medication (survey estimate)
09
Specialist visits: families reported a mean of 6 specialist appointments per year for Down syndrome management (survey estimate)
10
Therapy intensity: mean annual occupational therapy visits for children with Down syndrome were 18.1 (claims-based study estimate)
11
Sleep-related care: 28% of children with Down syndrome underwent evaluation or treatment for sleep-disordered breathing in a claims study (utilization estimate)
12
Obstructive sleep apnea screening programs increased CPAP use by 23% among treated pediatric Down syndrome patients (program evaluation estimate)
Interpretation
Care Costs & Utilization Interpretation
For the care costs and utilization angle, people with Down syndrome consistently show higher healthcare use and higher spending, including 1.7 times more hospitalizations and roughly $12,000 to $20,000 more annual direct medical costs depending on the study, alongside a caregiver burden where many provide an extra 15.2 hours of care per week and 34% cut work hours.
07 · Category
Advocacy & Policy3 stats
01
Down syndrome accounts for about 5% of all cases of congenital anomalies with intellectual disability in a European registry analysis (proportion estimate)
02
The U.S. Individuals with Disabilities Education Act (IDEA) supports early intervention and special education for eligible children (eligibility rules provide coverage for conditions like Down syndrome)
03
A policy consensus on trisomy 21 clinical management recommends annual screening for thyroid function and hearing/vision checks (guideline frequency quantities)
Interpretation
Advocacy & Policy Interpretation
Across advocacy and policy efforts, Down syndrome represents about 5% of congenital anomalies with intellectual disability in a European registry while U.S. IDEA underscores early intervention and special education and clinical policy consensus further supports consistent annual screening for thyroid function plus hearing and vision checks.
report visual · Breakdown
Common Health Concerns in Down Syndrome
Key health conditions reported as common in Down syndrome populations.
20%
20% of people with Down syndrome are affected by obstructive sleep apnea (systematic review estimate)
80%
In the NIPT validation study, positive predictive value for trisomy 21 was 80% in high-risk pregnancies (study-reported)
source-verifiedpublications.aap.org · nejm.org
Reference
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
APA
Karl Becker. (2026, February 13). Down Syndrome Statistics. Gitnux. https://gitnux.org/down-syndrome-statistics
MLA
Karl Becker. "Down Syndrome Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/down-syndrome-statistics.
Chicago
Karl Becker. 2026. "Down Syndrome Statistics." Gitnux. https://gitnux.org/down-syndrome-statistics.
Sources & references
52 datasets cited across this report · attribution is report-level
+32 additional datasets cited (not shown individually)