Table 2 Odds ratios (ORs) for a multivariable logistic regression of trial status on gestation, age category, deprivation category and body mass index (BMI) category

Gestation (weeks)

1.12

0.122

Gestation (squared)

0.99

0.007

Deprivation quintiles, n (%)

 1st

1.0

 2nd

1.13 (0.86, 1.49)

0.383

 3rd

1.25 (0.89, 1.77)

0.201

 4th

0.81 (0.50, 1.33)

0.416

 5th

1.08 (0.59, 1.96)

0.806

 under 20

1.0

 20–24

0.91 (0.64, 1.29)

0.590

 25–29

1.20 (0.85, 1.71)

0.301

 30–34

1.34 (0.93, 1.93)

0.117

 35+

1.10 (0.72, 1.67)

0.651

 Underweight

1.0

 Normal weight

1.19 (0.70, 2.03)

0.526

 Overweight

1.38 (0.80, 2.39)

0.251

 Obese

1.35 (0.77, 2.37)

0.288