Table 2.

Summary of subgroup analyses for TMT-A in schizophrenia patients

Subgroups	Mean and 95% CI	p-value	Sample size	τ2	I2 (%)	Q-value	df (Q)
Concurrent substance abuse
a. Absent	48.02 [43.08, 52.97]	0.112	489	59.86	86	76.24	11**
b. Present	58.94 [36.83, 81.05]		223	127.69	90	41.94	4**
Education (without concurrent substance abuse)
a. 12 years and below	47.14 [39.40, 54.89]	0.482	348	85.09	92	68.27	5**
b. More than 12 years	50.87 [43.91, 57.84]		34	38.85	50	4.02	4
Patients’ clinical status (without concurrent substance abuse)
a. Inpatients	47.89 [42.38, 52.59]	0.301	190	21.21	66	11.88	4*
b. Outpatients	51.31 [45.21, 57.41]		68	20.15	38	3.25	2
Duration of illness
a. 10 years and below	50.07 [43.92, 56.22]	0.872	199	24.18	64	8.24	2*
b. More than 10 years	49.35 [35.35, 63.35]		128	139.41	94	31.20	2**

^*p<0.050,

^**p<0.001.

CI: confidence interval, df: degree of freedom, τ2: tau-squared, TMT-A: Trail Making Test A