Occurrence of mood disturbances | Study group | Control group | RR | 95% conf. limit | |
n = 75 | n = 178 | ||||
Chronic depression | 28% | 14% | 2.1 | 1.3 - 3.5 | |
Other mood disturbance | 7% | 2% | 6.6 | 2.6 - 16.5 | |
Serious mood disturbance | 4% | 1% | 6.0 | 1.4 - 14.3 | |
None | 61% | 83% | - | - |