Table 1 Demographic characteristics
Characteristics | N (%) | |
|---|---|---|
HP (n = 466) | MDP (n = 53) | |
Age, mean ± SD, years | 28.81 ± 3.778 | 28.62 ± 3.914 |
Gender: | ||
Male | 180 (38.6) | 17 (32.1) |
Female | 286 (61.4) | 36 (67.9) |
Race: | Â | Â |
White | 363 (77.9) | 38 (71.7) |
Other | 103 (22.1) | 15 (28.3) |
Handedness: | ||
Right handedness | 294 (63.1) | 34 (64.2) |
Non-right handedness | 172 (36.9) | 19 (35.8) |
Education, years: | ||
≤11 | 7 (1.5) | 1 (1.9) |
12 | 58 (12.4) | 5 (9.4) |
13 | 24 (5.2) | 3 (5.7) |
14 | 52 (11.2) | 9 (17.0) |
15 | 31 (6.7) | 3 (5.7) |
16 | 221 (47.4) | 25 (47.2) |
≥17 | 73 (15.7) | 7 (13.2) |
Parental history of neuropsychiatric disorders: | ||
Yes | 119 (25.5) | 20 (37.7) |
No | 347 (74.5) | 33 (62.3) |
Smoking history: | ||
Never smoked | 316 (67.8) | 30 (56.6) |
Experimented 1–19 times | 27 (5.8) | 6 (11.3) |
Experimented 20–99 times | 59 (12.7) | 3 (5.7) |
Regular smoker | 64 (13.7) | 14 (26.4) |
Illicit drug use: | ||
Never used | 428 (91.8) | 42 (79.2) |
1–2 times | 23 (4.9) | 6 (11.3) |
3–10 times | 10 (2.1) | 5 (9.4) |
11–25 times | 3 (0.6) | – |
26–100 times | 2 (0.4) | – |
> 100 times (only male) | – | – |
Marijuana use: | ||
Never used | 297 (63.7) | 27 (50.9) |
1–5 times | 100 (21.5) | 15 (28.3) |
6–10 times | 26 (5.6) | 7 (13.2) |
11–100 times | 29 (6.2) | 3 (5.7) |
101–999 times | 10 (2.1) | 1 (1.9) |
≥1000 times | 4 (0.9) | – |
History of panic disorder/agoraphobia: | ||
Yes | – | 19 (35.8) |
No | – | 34 (64.2) |
DSM-IV anxiety problems raw score, median (interquartile range) | 3.5 (3) | 6 (3) |
DSM-IV depressive problems raw score, median (interquartile range) | 3 (4) | 6 (6) |
Adult self-report somatic complaints raw score, median (interquartile range) | 3 (3) | 3 (5) |