Baseline covariate comparison of included and excluded sample at T1
| Baseline data from T1 | Included sample (n=620) | Excluded sample (n=1876) | p Value |
| Mean age (SD) (years) | 35.9 (5.07) | 34.7 (5.37) | <0.001 * |
| Mean height † (SD) (cm) | 177 (6.19) | 177 (6.79) | 0.76 * |
| Mean BMI † (SD) (kg/m2) | 24.6 (2.84) | 25.2 (3.31) | <0.001* |
| Housing tenure‡ (%) | |||
| Own property and no mortgage | 4.68 | 3.78 | 0.03§ |
| Being bought/mortgaged | 90.2 | 88.2 | |
| Private Rented | 2.74 | 2.51 | |
| Council/Housing Assoc. rented | 1.29 | 3.57 | |
| Other | 1.13 | 1.92 | |
| Financial difficulties (%) | |||
| Least difficulty | 51.0 | 44.8 | 0.007 § |
| Slight difficulty | 15.5 | 14.3 | |
| Moderate difficulty | 20.0 | 22.4 | |
| Most difficulty | 13.6 | 18.5 | |
| Highest educational qualification † (%) | |||
| ≥Degree | 41.6 | 28.7 | <0.001 § |
| A Level | 29.4 | 30.0 | |
| O Level | 18.7 | 22.6 | |
| Vocational | 3.55 | 6.93 | |
| CSE | 6.77 | 11.8 | |
| Number of cigarettes a day (%) | |||
| None | 87.7 | 78.5 | <0.001 § |
| 1–9 | 5.16 | 9.28 | |
| 10–19 | 4.84 | 7.30 | |
| 20+ | 2.26 | 4.90 | |
| Alcohol consumption (%) | |||
| Less than once a week | 26.3 | 28.6 | 0.030 § |
| At least once a week | 45.0 | 43.8 | |
| 1–2 glasses near every day | 24.2 | 20.5 | |
| ≥3 glasses nearly every day | 4.52 | 7.14 | |
| Relationship quality score (%) | |||
| Least caring | 29.8 | 33.6 | 0.015 § |
| Moderately caring | 32.1 | 34.6 | |
| Most caring | 38.1 | 31.8 |
* t-test.
†Data from 3 years prior to T1 as approximation to T1.
‡Data from 3 years after to T1 as approximation to T1.
§ Χ2 test.