Table 2.
Group differences. Differences between positive (PTSD) and negative screening cases (without PTSD). Differences between these two groups on measures which were assessed in the validation interview are shown. Means and standard deviations (in brackets) or percentages and numbers (in brackets) are reported.
| Positive screening (14) | negative screening (48) | test statistic1 (df) | p | |
| SRQ-20 sum score | 9.07 (5.05) | 2.52 (4.11) | -5.010 (62) | < .001 |
| Psychotic symptoms | 57% (8) | 12% (6) | 6 | .001 |
| Number of traumatic events | 8.29 (3.00) | 6.54 (2.98) | -1.94 (62) | .057 |
| Years in armed conflict2 | 5.4 (4.0) | 4.8 (4.6) | -.450 (59) | .655 |
| Sum of minor physical symptoms in last month | 1.71 (1.68) | .82 (1.21) | -2.24 (62) | .029 |
| Average hours of sleep per 24 h in previous week | 6.43 (2.95) | 8.54 (2.39) | 2.776 (62) | .007 |
| Money spent on khat in last week (US$)3 | 7.38 (10.13) | 3.05 (5.80) | -1.317 | .191 |
| Average hours chewing khat per day in last week3 | 5.54 (5.94) | 3.14 (2.46) | -2.14 (56) | .037 |
| Khat used in combat 4 | 85% (11) | 68% (27) | 6 | .305 |
| Average numbers of cigarettes per day in last week 5 | 7.14 (7.52) | 4.94 (6.94) | -1.027 (60) | .309 |
1 student's t-test and Chi2 were used; Wilcoxon was performed when variances were unequal; exact test according to Fisher-Yates was performed when expected frequency/cell was below 5
2 different N: with PTSD 14, without PTSD 47
3 different N: with PTSD 13, without PTSD 45
4 different N: with PTSD 13, without PTSD 40
5 different N: with PTSD 14, without PTSD 48
6 exact test according to Fisher
7 Wilcoxon's test