Table 1.

Mixed model Poisson regression parameter estimates (±s.e.) and p-values (based on Z-value) for the effect of the average height and height2 of the sibling pair (standardized), sex of the individual and their interactions on the number of children, while controlling for birth year (centred), birth order and the number of living siblings (n = 6280).

parameter estimates (±s.e.)p-value
intercept0.827 (±0.020)<0.001
sex (ref. cat = male)0.060 (±0.023)0.002
pair height−2.68 × 10−5 (±1.43 × 10−2)0.998
pair height2−0.037 (±0.012)0.002
sex × pair height−0.048 (±0.019)0.011
sex × pair height20.042 (±0.016)0.008
birth year−0.032 (±2.31 × 10−3)<0.001
birth order−8.36 × 10−3 (±6.38 × 10−3)0.190
no. living siblings0.040 (±4.68 × 10−3)<0.001
random effectparameter estimates (±s.d.)
sibling pair0.010 ± 0.102