Table 2. The prevalence of suicide attempt in different subgroup of college students in China.

Subgroup	No. studies	P(%)	95%CI for P	Heterogeneity			Begg’s test		Egg’s test
				χ2	P	I2(%)	Z	P	t	P
Period
Life time	16	2.7	2.1–3.3	380.22	<0.001	96.1	1.13	0.26	1.63	0.13
12-month	13	2.9	2.0–3.8	292.49	<0.001	96.2	1.46	0.16	0.5	0.63
Gender
Male	14	2.4	1.8–3.0	281	<0.001	94.7	1.53	0.12	1.93	0.08
Female	14	2.7	1.9–3.7	337	<0.001	95.9	1.00	0.32	0.28	0.79
Grade
1	9	2.8	1.7–3.8	68.99	<0.001	88.2	0.6	0.55	1.7	0.15
2	6	1.8	1.2–2.3	43.84	<0.001	82.9	1.2	0.16	1.6	0.13
3	4	2.5	0.8–4.3	19.07	<0.001	84.3	-0.34	0.99	-0.59	0.61
4	2	2.9	0.1–6.7	5.70	0.017	82.5	<0.001	>0.99	-	-
Urban/Rural
Urban	3	3.7	1.4–5.9	21.56	<0.001	90.7	1.04	0.30	-1.53	0.37
Rural	3	5.1	2.8–7.5	18.86	<0.001	89.4	1.04	0.30	-2.00	0.30