Table 2

 Odds ratios (95% confidence intervals) of pregnancy induced hypertension during pregnancy comparing manual with non-manual social class at birth with adjustment for potential confounders

Covariate included in adjusted modelNumber of pregnancies in the subgroup with complete data on variable(s) included in adjusted modelCrude OR (95% CI) in the subgroup with complete data on variable(s)included in adjusted modelAdjusted OR(95% CI)
Number varies and is given in first column for each set of models. *Both outcomes are compared with a reference group of no evidence of pregnancy induced hypertension. †During participant’s intrauterine development. ‡All potential confounding factors: adult social class, maternal age, parity, smoking in pregnancy, history of pregnancy induced hypertension in participant of mother. Robust standard errors were used to take account of non-independence of data.
Outcome  =  pre-eclampsia*
Adult social class54961.10 (0.74 to 1.64)1.09 (0.73 to 1.63)
Maternal age54961.10 (0.74 to 1.64)1.06 (0.71 to 1.57)
Parity54541.10 (0.74 to 1.64)1.14 (0.77 to 1.69)
History of pregnancy induced hypertension in mother of participant†54961.10 (0.74 to 1.64)1.11 (0.75 to 1.65)
Smoking in pregnancy30891.08 (0.71 to 1.70)1.14 (0.75 to 1.78)
All potential confounding factors‡30891.08 (0.71 to 1.70)1.10 (0.72 to 1.73)
Outcome  =  gestational hypertension*
Adult social class54961.06 (0.90 to 1.25)1.05 (0.89 to 1.23)
Maternal age54961.06 (0.90 to 1.25)1.02 (0.87 to 1.21)
Parity54541.06 (0.90 to 1.25)1.08 (0.91 to 1.27)
History of pregnancy induced hypertension in mother of participant†54961.06 (0.90 to 1.25)1.07 (0.97 to 1.25)
Smoking in pregnancy38281.00 (0.82 to 1.31)1.03 (0.83 to 1.33)
All potential confounding factors‡38281.00 (0.82 to 1.31)1.02 (0.83 to 1.32)