Table 3.

Association of demographic and clinical variables with classification accuracy.

Sample	Variable	F	p
All	IQ × Group	0.5	0.68
All	Age × Group	1.65	0.18
All	Sex × Group	2.44	0.07
All	HRSD-25 × Group	0.73	0.54
All	MOODS-SR × Group	1.13	0.34
UD Only	Antidepressants	0.17	0.69
UD Only	Age of illness onset	0.39	0.53
UD Only	Illness duration	0.43	0.52
UD Only	Lifetime episodes of depression	1.67	0.2
UD Only	Number of comorbid diagnoses	0.13	0.72
UD Only	UD Diagnosis (MDD/PDD)	2.04	0.16
UD Only	Medication load	0.46	0.5

Joint regressions were run as Group × Variable + Group + Variable, predicting classification accuracy. No test was significant (all ps > 0.05). Medications other than antidepressants were not examined, as too few participants were taking them (Table 1).