Table 5.
Percentage difference (95 % confidence intervals) in General Health Questionnaire scores (GHQ-28) at age 53 years by thirds of dietary vitamin B12 intake (per MJ) at age 53, BMI and exercise level (n 665 women)
| Covariates | Unadjusted | P value* | Adjusted for BMI only | P value* | Adjusted for BMI and exercise levels | P value* |
|---|---|---|---|---|---|---|
| Vitamin B12 intake at age 53 years | 0·005 | 0·005 | 0·007 | |||
| Low | 18 (0·24, 36) | 18 (−1, 36) | 17 (−1, 35) | |||
| Middle | 30 (12, 48) | 29 (11, 47) | 29 (11, 47) | |||
| High | Reference | Reference | Reference | |||
| BMI at age 53 | 0·009 | 0·5 | 0·6 | |||
| Overweight (25·1-30·0 kg/m2) | 4 (−8, 16) | −3 (−20, 14) | −4 (−21,13) | |||
| Obese (>30·0 kg/m2) | 19 (7, 32) | 9 (−11, 28) | 7 (−13, 27) | |||
| Underweight or healthy (25·0 kg/m2)† | Reference | Reference | Reference | |||
| Exercise level at age 53 | 0·005 | - | 0·4 | |||
| None | 18 (7, 29) | 11 (−6, 27) | ||||
| 1-4 times per month | 7 (−8, 22) | 3 (−18, 24) | ||||
| >4 times per month | Reference | Reference |
*
P value from regression analysis test for heterogeneity among the intake of dietary vitamin B group.
†
Only one subject had BMI<20 kg/m2.