Table 5.
Results of meta-regression analyses to identify study-level demographic or methodological factors associated with reported BMI heritability estimates in family studies.
| Covariate(s) added | Co-efficient (SE) | P-value | Heritability estimate for reference group | 95% CI |
|---|---|---|---|---|
| Sample size (per participant) | −0.000 (0.00) | 0.132 | 0.60 | 0.42, 0.78 |
| Age* (per +1 year) | 0.005 (0.005) | 0.358 | 0.28 | 0.00,0.71 |
| Setting (Europe/USA = 0, East Asian = 1) | −0.048 (0.11) | 0.68 | 0.48 | 0.39, 0.58 |
| Publication year (per +1 year from 1984 to 2010) | 0.009 (0.006) | 0.184 | 0.30 | 0.03, 0.57 |
*Assessed as mean age where possible (n = 20) or mid-point of age range (n = 3).
Four estimates excluded from meta-regression for age as mean age or full age range of parents and children were not reported.