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Table 3 Clinical and drinking 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
AUDIT, mean (SD) 9.3 (6.6) 10.9 (7.3)a 10.8 (7.3)a 10.1 (6.9)a, b, c <0.001
Number of drinks consumed in a typical week, mean (SD) d 5.1 (1.9) 6.0 (1.8)a 6.0 (1.8) 5.9 (1.8)b, c <0.001
Largest number of drinks consumed on one occasion, mean (SD) d 8.4 (2.3) 9.3 (2.4)a 8.8 (2.4)a 8.3 (2.4)a <0.001
Number of consequences experienced, mean (SD) 1.7 (1.8) 2.3 (2.1)a 2.4 (2.1)a 2.2 (2.0)a, c <0.001
Ever attended formal treatment, % (n) 7.0 (61) 10.0 (323)a 10.2 (352)a 0.015
  1. AUDIT Alcohol Use Disorders Identification Test
  2. Group differences were computed using chi-squares and one-way ANOVA tests. To determine specific group differences, post-hoc tests were performed with Bonferroni and Games-Howell corrections; a significant difference compared to Trial 1; b significant difference compared to Trial 2; c significant difference compared to Trial 3
  3. d Geometric means were used to account for the positive skew observed in the raw data; computed by averaging logarithmic values, and then converted back to a base 10 number of drinks