Williams R J, Schmidt G G
Department of Health, Province of Manitoba, Thompson, Canada.
Psychiatry Res. 1993 Jan;46(1):41-5. doi: 10.1016/0165-1781(93)90006-3.
The frequency of seasonal affective disorder (SAD) was examined in clients receiving treatment for recurrent mood disturbances in a northern Canadian site. Approximately one-fifth of these individuals were identified as having SAD when file histories and a statistical criterion were used as the basis for assessment. The failure to find a higher prevalence rate at this latitude may be due to other studies' reliance on client self-report, a tendency for individuals with SAD to relocate south, or a greater tendency for clients with SAD to be seen by general practitioners and alcohol treatment centers in the north.
在加拿大北部一个地点，对接受复发性情绪障碍治疗的患者进行了季节性情感障碍（SAD）的发病率调查。当依据档案记录和统计标准进行评估时，约五分之一的此类个体被认定患有SAD。在这个纬度未能发现更高的患病率，可能是由于其他研究依赖患者自我报告、患有SAD的个体有南迁的倾向，或者在北方，患有SAD的患者更倾向于去看全科医生和酒精治疗中心。
