A Comprehensive Analysis of Bone Mineral Density Changes across the Lifespan: Insights from National Surveys.
Level 4 - case-series / case-control
Cross-sectional survey analysis of pooled national data
PubMed 39203940 · doi:10.3390/nu16162804
What was done
Researchers analyzed dual-energy X-ray absorptiometry (DXA) scans from participants aged 8 to 85 years across three major ethnic groups using National Health and Nutrition Examination Survey (NHANES) data from 1999 to 2018. The sample included 46,381 participants for lumbar spine BMD (LSBMD) and 20,944 participants for femoral neck BMD (FNBMD). Generalized additive models were applied to construct smoothed percentile curves to identify life-stage trends and the timing of peak BMD (PBMD).
What was found
Both sexes showed sharp pubertal increases in LSBMD, with females reaching PBMD earlier than males. Females maintained higher LSBMD than males before approximately age 50, except among Non-Hispanic Black participants. Male LSBMD plateaued around age 30 after peaking, whereas female fitted curves showed two peak points, with the second occurring at roughly 36–37 years. FNBMD peaked earlier than LSBMD, and males consistently had higher FNBMD than females. Non-Hispanic Black individuals had the highest BMD at all ages, while Non-Hispanic White and Mexican American participants had lower BMD, with Mexican Americans generally having the lowest. The abstract provides no exact numerical BMD values or confidence intervals.
Why it matters
These population-level percentile curves delineate timing differences in bone accrual and loss across sexes, anatomical sites, and major ethnic groups, providing normative reference patterns across the lifespan.
Limits
The study is cross-sectional rather than longitudinal, leaving trajectory estimates susceptible to birth-cohort effects. The abstract reports no raw numerical values, standard deviations, or effect sizes. Data are restricted to three US ethnic groups and do not detail adjustments for dietary, hormonal, or lifestyle confounders.
Cited by
- partial Muscle mass and bone density peak around age 25 and steadily decline thereafter.