Table 5.
Correlates of participating in leisure time physical activity at 18 weeks of gestation, ALSPAC
| Characteristic | Top quintile of weighted activity indexa | Brisk Walkinga | Swimminga | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Crude OR (95% CI) | AORb (95% CI) | P value for trend | Crude OR (95% CI) | AORb (95% CI) | P value for trend | Crude OR (95% CI) | AORb (95% CI) | P value for trend | |
| Age (years) | |||||||||
| ≤19 | 1.3 (0.9, 1.9) | 1.8 (1.2, 2.7) | 0.9 (0.6,1.2) | 1.2 (0.8, 1.7) | 0.7 (0.5, 1.0) | 1.5 (1.1, 2.1) | |||
| 20–24 | 1.0 (0.8, 1.3) | 1.3 (1.0, 1.7) | 0.9 (0.7, 1.1) | 1.0 (0.8, 1.3) | 0.8 (0.7, 1.0) | 1.3 (1.1, 1.6) | |||
| 25–29 | 1.1 (0.9, 1.4) | 1.3 (1.0, 1.6) | 1.1 (0.9,1.4) | 1.2 (1.0, 1.4) | 1.1 (0.9, 1.3) | 1.4 (1.1, 1.5) | |||
| 30–34 | 1.2 (0.9, 1.5) | 1.2 (1.0, 1.6) | 1.3 (1.1, 1.6) | 1.3 (1.1, 1.6) | 1.2 (1.0, 1.4) | 1.2 (1.1, 1.5) | |||
| ≥35 | Reference | Reference | 0.015 | Reference | Reference | 0.664 | Reference | Reference | 0.007 |
| Education | |||||||||
| A or university | 2.2 (1.8, 2.6) | 2.3 (1.9, 2.9) | 2.1 (1.8, 2.5) | 2.0 (1.7, 2.4) | 2.4 (2.1, 2.7) | 2.0 (1.7, 2.4) | |||
| O level | 1.4 (1.1, 1.7) | 1.5 (1.2, 1.8) | 1.6 (1.4, 1.8) | 1.5 (1.3, 1.8) | 1.5 (1.3, 1.7) | 1.4 (1.2, 1.6) | |||
| Vocational | 1.1 (0.9. 1.5) | 1.1 (0.9, 1.5) | 1.1 (0.9, 1.4) | 1.1 (0.9, 1.4) | 1.4 (1.1, 1.6) | 1.3 (1.1, 1.6) | |||
| None or CSE | Reference | Reference | <0.001 | Reference | Reference | <0.001 | Reference | Reference | <0.001 |
| Highest social class of the couple | |||||||||
| I | 1.6 (1.2, 2.2) | 1.1 (0.8, 1.5) | 1.4 (1.1, 1.8) | 0.8 (0.6, 1.1) | 2.5 (1.9, 3.2) | 1.7 (1.3, 2.2) | |||
| II | 1.4 (1.0, 1.9) | 1.1 (0.8, 1.5) | 1.2 (0.9, 1.5) | 0.8 (0.7, 1.1) | 1.8 (1.4, 2.3) | 1.4 (1.1, 1.8) | |||
| III, Non-manual | 1.0 (0.8, 1.4) | 1.0 (0.7, 1.3) | 0.9 (0.7, 1.2) | 0.8 (0.6, 1.0) | 1.2 (1.0, 1.6) | 1.1 (0.9, 1.4) | |||
| III, Manual | 1.2 (0.8, 1.6) | 1.1 (0.8, 1.5) | 0.9 (0.7, 1.2) | 0.8 (0.6, 1.1) | 1.1 (0.9, 1.5) | 1.1 (0.8, 1.4) | |||
| IV and V | Reference | Reference | 0.423 | Reference | Reference | 0.585 | Reference | Reference | <0.001 |
| Employment at 18 weeks | |||||||||
| Not employed | 1.1 (1.0, 1.2) | 1.2 (1.1, 1.4) | 1.1 (1.0, 1.2) | 1.3 (1.2, 1.5) | 0.9 (0.9, 1.1) | 1.0 (0.9, 1.1) | |||
| Employed | Reference | Reference | Reference | Reference | Reference | Reference | |||
| Marital status at 8 weeks | |||||||||
| Married | 0.9 (0.8, 1.1) | 0.8 (0.7, 1.0) | 1.2 (1.1, 1.4) | 1.1 (1.0, 1.3) | 1.2 (1.1, 1.4) | 0.9 (0.8, 1.1) | |||
| Unmarried | Reference | Reference | Reference | Reference | Reference | Reference | |||
| Smoking before pregnancy | |||||||||
| No | 1.1 (0.9, 1.2) | 0.9 (0.8, 1.1) | 1.3 (1.1, 1.4) | 1.1 (1.0, 1.3) | 1.5 (1.3, 1.6) | 1.2 (1.1, 1.4) | |||
| Yes | Reference | Reference | Reference | Reference | Reference | Reference | |||
| General health | |||||||||
| Always well | 1.5 (1.2, 1.9) | 1.5 (1.2, 1.9) | 1.6 (1.3, 1.9) | 1.4 (1.1, 1.7) | 1.3 (1.1, 1.6) | 1.1 (0.9, 1.4) | |||
| Usually well | 1.1 (0.9, 1.4) | 1.1 (0.8, 1.4) | 1.4 (1.1, 1.7) | 1.3 (1.0, 1.5) | 1.1 (0.9, 1.3) | 1.0 (0.8, 1.2) | |||
| Unwell | Reference | Reference | <0.001 | Reference | Reference | 0.004 | Reference | Reference | 0.037 |
| Pre-pregnancy BMI | |||||||||
| Underweight | 1.0 (0.7, 1.3) | 1.0 (0.8, 1.3) | 0.9 (0.7, 1.2) | 1.0 (0.8, 1.3) | 0.8 (0.6, 1.0) | 0.9 (0.7, 1.1) | |||
| Normal weight | Reference | Reference | Reference | Reference | Reference | Reference | |||
| Overweight | 0.9 (0.8, 1.1) | 1.1 (0.9, 1.2) | 0.8 (0.7, 0.9) | 0.9 (0.8, 1.0) | 1.0 (0.9, 1.1) | 1.1 (1.0, 1.2) | |||
| Obese | 0.8 (0.6, 1.1) | 1.0 (0.8, 1.3) | 0.647 | 0.7 (0.5, 0.8) | 0.8 (0.6, 0.9) | 0.004 | 0.7 (0.6, 0.9) | 0.9 (0.7, 1.1) | 0.779 |
| Previous live births | |||||||||
| 0 | Reference | Reference | Reference | Reference | Reference | Reference | |||
| 1 | 1.0 (0.9, 1.1) | 1.0 (0.9, 1.2) | 1.0 (0.9, 1.1) | 0.9 (0.8, 1.0) | 1.3 (1.2, 1.5) | 1.4 (1.3, 1.6) | |||
| ≥2 | 0.9 (0.8, 1.0) | 1.0 (0.8, 1.2) | 0.868 | 0.9 (0.8, 1.0) | 0.8 (0.7, 1.0) | 0.036 | 1.0 (0.9, 1.1) | 1.2 (1.0, 1.4) | <0.001 |
CI confidence interval, AOR adjusted odds ratio
aDue to additional missing values in outcome variables or covariates included in the models, the analytical sample size for weighted activity index = 8,135, brisk walking = 8,055, swimming = 8,003
bAll models adjusted for all variables listed in the table