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Table 2 Demographic characteristics of the four recruitment samples
| Trial 1 (n = 871) | Trial 2 (n = 3244) | Trial 3 (n = 3456) | Trial 4 (n = 3536) | p | |
|---|---|---|---|---|---|
| US Resident, % (n) | – | – | 99.0 (3421) | 98.8 (3492) | 0.360 |
| Mean (SD) Age | 36.4 (10.5) | 35.5 (10.9) | 34.5 (10.7) a, b | 33.5 (10.4) a, b, c | <0.001 |
| Male, % (n) | 47.9 (417) | 46.8 (1516) | 42.8 (1478) a, b | 43.2 (1527) b | 0.001 |
| White, % (n) | 82.9 (722) | 80.6 (2615) | 79.1 (2735) | 82.3 (2910) c | 0.003 |
| Some post-secondary education, % (n) | 72.9 (635) | 71.1 (2305) | 72.0 (2489) | 71.2 (2517) | 0.618 |
| Married / Common-law, % (n) | 53.7 (468) | 50.1 (1624) | 48.1 (1661) a | 47.5 (1679) a | 0.003 |
| Full-time employed, % (n) | 70.3 (612) | 64.7 (2098) a | 59.7 (2062) a, b | 57.2 (2022) a, b | <0.001 |
| Family income less than US$20000, % (n) | 27.6 (240) | 17.3 (560) a | 19.3 (667) a | 20.5 (724) a, b | <0.001 |
