Table 1. Principal component analysis of negative symptoms—item loadings.

	Factor 1	Factor 2	Factor 3	Factor 4
Oversleeping	0.61	0.05	−0.04	0.05
Inability to get things done	0.77	0.09	0.04	0.01
Trouble getting things started	0.78	0.11	−0.01	−0.04
Anergia	0.53	0.15	0.08	0.02
Being a loner	0.15	0.52	−0.05	0.02
Being a closed person	0.10	0.78	−0.03	0.01
Rarely visiting or talking to others	0.12	0.79	0.02	0.01
Not making friends easily	−0.01	0.67	0.15	0.06
Feeling detached from others	0.37	0.53	0.04	0.03
Unclear speech	−0.01	0.06	0.75	−0.03
Repeats words mechanically	−0.01	0.01	0.70	−0.02
Poor cleanliness and self-care	0.07	0.03	0.40	0.17
No external expression	0.05	0.04	0.19	0.80
Frozen expression	−0.01	0.06	−0.04	0.84