Table 1.
Descriptive sample data and between-group differences for socio-demographic variables.
| Variable/descriptives | Infrasound—verum (n = 23) | Infrasound—placebo (n = 15) | Inferential statistics |
|---|---|---|---|
| Age: mean (SD) | 27.35 (6.44) | 25.60 (4.76) | t(36) = 0.90, p = .373 |
| Sex: percentage male/female (no. male/no. female) | 43.5/ 56.5 (10/13) | 33.3/ 66.7 (5/10) | X2(1, 38) = 0.39, p = .532 |
| Years of education | 15.26 (3.97) | 15.40 (1.81) | t(36) = 0.13, p = .900 |
| Children: percentage yes/no (no. yes/no) | 17.4/ 82.6 (4/19) | 6.7/ 93.3 (1/14) | X2(1, 38) = 0.91, p = .339 |
| Nationality: percentage German/other (no. German/ other) | 91.3/ 8.7 (21/2) | 93.3/ 6.7 (14/ 1) | X2(1, 38) = 0.05, p = .821 |
| Regular medication: percentage yes/ no (no. yes/no) | 13.0/87.0 (3/20) | 20.0/80.0 (3/12) | X2(1, 38) = 0.33, p = .565 |