Table 1.

Performance of receiver operating curve Seasonal Beliefs Questionnaire total score and subscale combination score cutpoint criteria in predicting seasonal affective disorder, nonseasonal Major Depressive Disorder, or control status

Predictor	Group Outcome Variable	C-Statistic	Cutpoint (≥)	Sensitivity	Specificity
SBQ total	SAD vs. MDD	0.792	132	0.798	0.714
SBQ scale score	SAD vs. MDD	0.813	808	0.930	0.571
SBQ total	SAD vs. Control	0.962	121	0.939	0.873
SBQ scale score	SAD vs. Control	0.976	1191	0.991	0.903
SBQ total	MDD vs. Control	0.789	118	0.600	0.858
SBQ scale score	MDD vs. Control	0.842	399	0.743	0.910
DAS total	SAD vs. MDD	0.636

Note. SBQ = Seasonal Beliefs Questionnaire, DAS = Dysfunctional Attitudes Scale-Form A, SAD = Seasonal affective disorder patient status, MDD = nonseasonal Major Depressive Disorder patient status, Control = healthy control status, defined as no history of Major Depressive Disorder and global seasonality score in the normal range. Sensitivity (i.e., the proportion of true positives correctly classified) and specificity (i.e., the proportion of true negatives correctly classified) is at or above the cutpoint score on the predictor.