Table 1 Demographic makeup of both groups (mean and SD) and statistical tests to assess sample differences.

From: Computational mechanisms underlying multi-step planning deficits in methamphetamine use disorder

Measure

Healthy comparisons (n = 49)

Individuals with methamphetamine use disorder (n = 40)

Statistical comparison

Sex (F)

36

12

χ2(1) = 31.77, p < 0.001

Age

35.14 (13.3)

37.12 (7.12)

t(87) = 0.85, p = 0.399

Working Memorya

52.19 (8.13)

46.78 (10.03)

t(82) = 2.73, p = 0.008

PHQ-9

1.88 (2.39)

4.28 (4.18)

t(87) = 3.39, p = 0.001

OASIS

1.18 (1.58)

4.90 (3.53)

t(87) = 6.61, p < 0.001

DAST

--

7.72 (1.91)

--

  1. Working memory scores are fully corrected for age, sex, education, and race/ethnicity. We used two-sided t-tests (and a chi-squared test in the case of sex) to measure the significance of differences between the two groups.
  2. Bolding indicates statistically significant effects.
  3. aData only available in a subset of participants: HCs: n = 47, iMUDs: n = 37.
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