Table 1.

Characteristics of the Medicated and Antipsychotic-Naive Study Samples

	Medicated Sample	Antipsychotic-Naive Sample
Number of study samples (unique studies)	347 (283)	35 (33)
Number of patients/ controls	8327/8292	771/939
Age patients/controls (y)	32.4 (8.6)/32.1 (8.7)	28.0 (4.7)/27.4 (3.9)
Duration of illness (y)	10.0 (6.8)	3.1 (2.5)
Sex patients/controls (% male)	72.0/67.0*	64.8/60.6
Current dose of antipsychotic medication1	413.7 (240.5)	0 (0)
Number of investigated brain regions	5.4 (6.1)	4.5 (3.1)
Magnetic field strength 1.5T (% of study samples)	87.8%	88.9%
Slice thickness in mm (range)	0.82–5.5	1.0–5.0
Segmentation on contiguous slices (% of study samples)2	96.4	95.5

Note: Data represent mean values (SD), unless indicated otherwise.

¹Data represent chlorpromazine equivalents; data given for 164 study samples for the medicated sample.

²Data given for 225 and 23 study samples, respectively.

*P < .0001.