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Table 2 Demographic characteristics of the four recruitment samples

From: Using Mechanical Turk to recruit participants for internet intervention research: experience from recruitment for four trials targeting hazardous alcohol consumption

  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
  1. Group differences were computed using chi-squares and one-way ANOVA tests. To determine specific group differences, post-hoc tests were performed with Bonferroni corrections; a significant difference compared to Trial 1; b significant difference compared to Trial 2; c significant difference compared to Trial 3