Table 2.

Regression coefficients for return saccade probability and exploration area explained by the demographic and clinical characteristics of HCs and SZs.

	Return saccade probability			Exploration area
	Coefficient	Adjusted R2	p value	Coefficient	Adjusted R2	p value
Healthy controls (N = 490)
Demographics
Age (years)	0.003	0.009	0.07	− 0.005	0.029	< 0.001
Education (years)	− 0.011	0.000	0.99	0.023	0.008	0.41
Current IQ	− 0.006	0.029	0.001	0.007	0.039	< 0.001
Schizophrenia (N = 122)
Demographics
Age (years)	− 0.001	− 0.008	1.00	− 0.008	0.009	1.00
Education (years)	0.000	− 0.008	1.00	− 0.015	− 0.005	1.00
Current IQ*	− 0.009	0.033	0.21	0.008	0.026	0.49
Estimated premorbid IQ*	0.004	− 0.005	1.00	0.001	− 0.008	1.00
Cognitive decline*	− 0.014	0.105	0.02	0.015	0.041	0.07
Onset age (years)	0.000	− 0.008	1.00	0.000	− 0.008	1.00
Duration of illness (years)	− 0.001	− 0.008	1.00	− 0.001	− 0.008	1.00
Symptoms
PANSS total	0.003	− 0.003	1.00	0.003	− 0.003	1.00
PANSS positive	− 0.001	− 0.008	1.00	− 0.001	− 0.008	1.00
PANSS negative	0.021	0.008	0.78	0.021	0.008	0.78
PANSS general	0.007	− 0.002	1.00	0.007	− 0.002	1.00
Drug (mg/day)
CPZ eq.	0.000	− 0.008	1.00	0.000	− 0.008	1.00
Typical antipsychotic eq.	0.000	0.007	1.00	0.000	0.007	1.00
Atypical antipsychotic eq.*	0.000	0.004	1.00	0.000	0.004	1.00
Diazepam eq.*	− 0.003	− 0.005	1.00	− 0.003	− 0.005	1.00
Biperiden eq.*	− 0.118	0.044	0.45	− 0.118	0.044	0.45

Bonferroni-corrected p values (raw p value × 3 for HCs, × 16 for SZs) and adjusted R² are shown. A negative adjusted R² is interpreted as zero variance explained. Bold underlined values highlight statistically significant contributions (p < 0.05).

*In SZs, N = 121 for current IQ, estimated premorbid IQ, cognitive decline, and atypical antipsychotic eq., N = 94 for diazepam eq., and N = 80 for biperiden eq.

PANSS Positive and Negative Syndrome Scale, CPZ eq. chlorpromazine equivalents.