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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