Table 2.

Meta-analysis of risk of schizophrenia by month of birth.

Months	Number of studies	RR (95%CI)	p-value	Heterogeneity (I2)	Egger's Test (p-value)
January	10	1.06 (1.03–1.1)	<0.001	77%	0.36
February	10	1.03 (1.00–1.05)	0.02	55%	0.67
March	10	1.03 (0.98–1.07)	0.21	89%	0.35
April	10	1.01 (0.99–1.03)	0.32	41%	0.59
May	10	1.01 (0.99–1.03)	0.25	23%	0.23
June	10	0.98 (0.95–1.02)	0.32	78%	0.90
July	10	0.97 (0.94–0.99)	0.01	59%	0.72
August	10	0.96 (0.93–0.98)	0.04	70%	0.54
September	10	0.95 (0.92–0.98)	<0.001	71%	0.86
October	10	0.97 (0.95–0.98)	<0.001	12%	0.33
November	10	0.99 (0.96–1.01)	0.36	58%	0.26
December	10	1.04 (1.00–1.08)	0.04	83%	0.22