Table 1. The general results of the meta-analysis for N400 measures with SOA as moderator.

N400 measures		K	NP	NC	D	Z	P	95% CI	Heterogeneity
									I-squared	P
N400 Peak latency	All	9	149	147	0.65	4.32	<0.001	0.36–0.95	35.18%	0.13
	Long SOA	6	100	98	0.82	5.51	<0.001	0.53–1.11	0.00%	0.49
N400 effect (difference wave)	All	21	375	365	−0.64	3.97	<0.001	−0.97−−0.31	77.94%	<0.001
	Short SOA	6	137	125	−0.41	3.29	0.001	−0.66−−0.17	4.96%	0.38
	Long SOA	11	177	181	−0.36	3.33	0.001	−0.58−−0.14	4.73%	0.40
N400 Amplitudes for congruent/related conditions	All	15	241	241	−0.55	−2.98	<0.01	−0.92−−0.19	73.47%	0.00
	Short SOA	5	84	84	−0.17	0.97	0.33	−0.52−0.17	50.32%	0.09
	Long SOA	7	105	107	−0.52	−3.35	<0.001	−0.83–0.22	0.00%	0.56
N400 Amplitudes for incongruent/unrelated conditions	All	16	261	261	−0.01	−0.11	0.91	−0.24−0.22	42.64%	0.04
	Short SOA	5	82	82	0.24	1.19	0.23	−0.16−0.64	53.98%	0.07
	Long SOA	10	166	168	−0.15	−1.0	0.30	−0.43−0.13	29.70%	0.17

D = effect size; K = number of studies used for meta-analysis; NC = number of Controls; NP = number of patients; short SOA = less than 500 ms; long SOA = larger than 500 ms at word level or at sentence level; SZ = schizophrenia.