74 Chapter 4 Sample characteristics The data of 54 participants was analyzed (Mage = 23.31, SD = 5.64, range = 18-43; see Table 4.1). There were no significant between-group differences on any of the baseline measures. The manipulation was successful: compared to the placebo group, testosterone levels after testosterone administration (sample 3) were significantly higher in the enhanced group, moreover blinding was successful, participants were unaware if they received T or P (see Table 4.1). Table 4.1 Sample characteristics (N = 54) Total sample N = 54 Placebo n = 27 Testosterone n = 27 t or χ2, p Demographics Age 23.31 (5.64) 24.00 (6.85) 22.61 (4.12) 0.90, .372 SPS total score 30.20 (11.85) 32.15 (13.82) 28.26 (9.35) 1.21, .232 LSAS total score 63.06 (19.24) 64.70 (18.96) 61.41 (19.73) 0.62, .534 Initial SUD score 20.59 (13.86) 20.44 (11.33) 20.74 (16.21) 0.77, .938 Testosterone sample 1 15.17 (16.41) 15.94 (19.65) 15.47 (12.76) .105, .917 Testosterone sample 2 16.21 (15.45) 17.57 (16.83) 14.80 (14.06) .650, .518 Testosterone sample 3 252.49 (380.03) 15.29 (16.19) 489.68 (421.06) -5.85, <.001 Educational level High school 7 2 5 1.15, .680 Intermediate vocational 6 3 3 Higher vocational 11 6 5 University 30 16 14 Psychological treatment (n) 9 5 4 .13, .715 Psychotropic medication use (n) 4 2 2 2.00, .572 Contraceptive use (n) 1.29, .733 Hormonal 30 15 15 .00, 1.00 Non-hormonal 24 12 12 Comorbid anxiety disorder (n) 18 11 7 1.39, .239 Comorbid depressive disorder (n) 5 2 3 .22, .639 Participants believed to be in T group (n) 12 7 5 Note. For testosterone sample 2 in the testosterone group n = 26 as one participant had a missing value. Testosterone values are in picograms per milliliter (pg/ml). SPS = Social Phobia Scale; LSAS = Liebowitz Social Anxiety Scale; SUD = subjective units of distress.
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