Table 3.

Descriptive statistics of the continuous variables for Sample set 1.

Variable name	Score range	Group	Total n	Min-Max	Median
6-item Global Seasonality Score* (GSS)	0-18	Cases	76	0-13	6.00
		Controls	517	0-18	4.00
21-item Beck Depression Inventory* (BDI)	0-55	Cases	76	0-44	18.50
		Controls	517	0-24	3.00
12-item General Health Questionnaire* (GHQ)	0-36	Cases	76	0-12	7.00
		Controls	517	0-12	0.00
Maslach Burnout Inventory-General* (MBI)	0-16	Cases	76	0.26-4.73	2.18
		Controls	517	0.00-3.88	0.79
Length of night sleep (h)	4-12	Cases	76	4-12	6.00
		Controls	517	4-11	7.00

* GSS, BDI, GHQ and MBI scores were higher for cases than controls in Sample set 1 (P < 0.0001).