Correlation matrix of sociodemographic variables and birth outcome as weight and length at birth: fullterm singleton births, cohorts combined (n=837), Spearman correlation coefficients (p value). (1908 cohort excluded for birth weight, 1908 and 1914 excluded for birth length)
| Birth weight | Birth length | Delivery site | Maternal marital status | Maternal age | Maternal parity | Gestational age | Birth cohort | |
| Birth length (n=686) | 0.64 (0.001) | |||||||
| Delivery site (home=1, hospital=2) | −0.29 (0.001) | −0.21 (0.001) | ||||||
| Maternal marital status (unmarried=0, married=1) | 0.13 (0.001) | 0.09 (0.05) | −0.11 (0.01) | |||||
| Maternal age | 0.15 (0.001) | 0.13 (0.01) | −0.21 (0.001) | 0.21 (0.001) | ||||
| Maternal parity | 0.28 (0.001) | 0.18 (0.001) | −0.26 (0.001) | 0.19 (0.001) | 0.58 (0.001) | |||
| Gestational age | 0.21 (0.001) | 0.24 (0.001) | −0.02 (0.52) | 0.02 (0.49) | 0.0004 (0.99) | 0.01 (0.71) | ||
| Birth cohort (1–4)2-150 | 0.02 (0.55) | 0.09 (0.05) | −0.23 (0.001) | 0.12 (0.001) | −0.02 (0.55) | −0.10 (0.01) | 0.03 (0.38) | |
| Parenteral social group (I–V)† | −0.03 (0.35) | −0.07 (0.07) | 0.10 (0.01) | −0.17 (0.001) | −0.09 (0.01) | 0.05 (0.28) | −0.01 (0.88) | 0.03 (0.38) |
↵2-150 1=1914, 2=1918, 3=1922, 4=1930, †if married then father's occupation, otherwise mother's.