Table 3

ORs (95% CI) for menstruation by income and ethnicity (n=5839)

Model 0: ageModel 1: age, income, ethnicityModel 2: Model 1+birth weightModel 3: Model 1+BMIModel 4: Model 1+psychosocial stressorsModel 5: fully adjusted
Income (ref.: richest quintile)
 Fourth1.02 (0.7 to 1.5)1.03 (0.7 to 1.5)1.02 (0.7 to 1.5)0.99 (0.7 to 1.5)0.99 (0.7 to 1.5)0.95 (0.6 to 1.4)
 Third1.27 (0.9 to 1.8)1.29 (0.9 to 1.8)1.28 (0.9 to 1.8)1.26 (0.9 to 1.8)1.21 (0.9 to 1.7)1.18 (0.8 to 1.7)
 Second1.92*** (1.4 to 2.7)1.86*** (1.3 to 2.6)1.82*** (1.3 to 2.6)1.74** (1.2 to 2.4)1.64** (1.2 to 2.3)1.52* (1.1 to 2.2)
 Poorest2.14*** (1.5 to 3.0)1.95*** (1.4 to 2.8)1.89*** (1.3 to 2.7)1.86*** (1.3 to 2.7)1.60* (1.1 to 2.4)1.52* (1.0 to 2.3)
Ethnicity (ref.: white)
 Indian3.53*** (2.2 to 5.8)3.55*** (2.2 to 5.7)3.26*** (2.0 to 5.2)3.95*** (2.4 to 6.4)3.69*** (2.3 to 6.0)3.66*** (2.3 to 5.9)
 Pakistani1.87** (1.2 to 2.9)1.43 (0.9 to 2.2)1.35 (0.9 to 2.1)1.62* (1.0 to 2.5)1.39 (0.9 to 2.1)1.45 (0.9 to 2.3)
 Bangladeshi3.27*** (2.2 to 5.0)2.45*** (1.6 to 3.8)2.24*** (1.4 to 3.5)2.36*** (1.5 to 3.8)2.54*** (1.6 to 4.0)2.15** (1.3 to 3.5)
 Black Caribbean1.62 (0.9 to 3.1)1.39 (0.7 to 2.6)1.34 (0.7 to 2.5)1.20 (0.6 to 2.4)1.32 (0.7 to 2.5)1.08 (0.5 to 2.2)
 Black African3.00*** (1.6 to 5.6)2.53** (1.3 to 4.9)2.50** (1.3 to 4.8)1.88* (1.0 to 3.5)2.58** (1.3 to 5.0)1.87* (1.0 to 3.4)
 Other1.93* (1.0 to 3.7)1.85 (1.0 to 3.5)1.82 (0.9 to 3.5)2.03* (1.0 to 4.0)1.88 (1.0 to 3.6)2.02 (1.0 to 4.1)
Age (in years and centred at mean)4.73*** (3.5 to 6.4)4.98*** (3.7 to 6.7)4.87*** (3.6 to 6.6)4.90*** (3.6 to 6.7)4.81*** (3.5 to 6.5)5.02*** (3.7 to 6.8)4.97*** (3.6 to 6.8)
Birth weight (kg)0.78** (0.6 to 0.9)0.71*** (0.6 to 0.9)
BMI (kg/m2)1.18*** (1.1 to 1.2)1.19*** (1.1 to 1.2)
Mother's psychological distress1.00 (1.0 to 1.0)1.00 (1.0 to 1.0)
Racism in area is fairly/very common1.16 (0.8 to 1.7)1.03 (0.7 to 1.5)
Lone parent family1.15 (0.9 to 1.5)1.09 (0.8 to 1.5)
Total difficulties score1.03** (1.0 to 1.1)1.03* (1.0 to 1.1)
  • All estimates are weighted with overall survey weights.

  • ***p<0.001, **p<0.01, *p<0.05.

  • BMI, Body Mass Index.