Table 1. Characteristic of Studies on the Prevalence of Suicidal Ideation among College Students.

NO.	First author	Publication year	Region	Province	Area	Age (mean years)	Male Percent (%)	Medical student	Screening method	Screening tools	Response Rate (%)	Suicidal ideation	Sample size	Prevalence (%)
1	Wang [13]	2012	Mainland	Henan	Northern	17–22	44.2	No	Q	UPI	97.10	162	3850	4.21
2	Chen [14]	2010	Mainland	Chongqing	Southern	20.0	56.6	Yes	Q	SMQ	81.0	1279	9808	13.0
3	Xu [15]	2004	Mainland	Hunan	Southern	-	53.4	Yes	Q	SMQ	97.9	89	610	14.6
4	Chen [16]	2008	Mainland	Jilin	Northern	21.3	67.1	Yes	QI	CIDI	98.9	97	1822	5.3
5	Liu [17]	2007	Mainland	Yunnan	Southern	21.2	50.4	No	Q	SMQ	97.4	437	3313	13.2
6	Chao [18]	2008	Mainland	Jiangxi	Southern	-	51.8	No	Q	SMQ	84.2	113	1010	11.2
7	Shang [19]	2008	Mainland	Gansu	Northern	20.5	35.8	Yes	Q	SMQ	92.3	411	2678	15.4
8	Qian [20]	2008	Mainland	Beijing	Northern	-	35.4	Yes	Q	SMQ	88.2	122	2199	5.6
9	Yang [21]	2013	Mainland	Henan	Southern	20.7	33.5	Yes	Q	UPI	92.2	110	1372	8.0
10	Zhang [22]	2007	Mainland	Guangdong	Southern	-	52.8	Yes	Q	EPQ	99.3	1763	7189	24.5
11	Wang [23]	2011	Mainland	Yunnan	Southern	18.9	35.5	Yes	Q	SMQ	99.84	409	1850	22.1
12	Jiang [24]	2006	Mainland	Fujian	Southern	-	56.3	Yes	Q	SMQ	90.4	171	1254	13.6
13	Li [25]	2009	Mainland	Beijing	Northern	25.1	64.4	No	Q	UPI	97.6	380	21072	1.8
14	Li [26]	2007	Mainland	Zhejiang	Southern	18.6	40.1	No	Q	SCL-90	95.0	800	8160	9.8
15	Bao [27]	2009	Mainland	Anhui	Southern	20.1	61.0	Yes	Q	BSSI	92.7	217	1529	14.2
16	Huang [28]	2007	Mainland	Zhejiang	Southern	18.85	64.0	No	QI	SCL-90	94.2	219	3564	6.1
17	Wang [29]	2011	Mainland	Shanxi	Northern	19.2	44.9	Yes	Q	SDSS	98.3	74	1177	6.3
18	Kong [30]	2012	Mainland	Anhui	Southern	20.4	42.9	Yes	Q	SMQ	91.8	444	3030	14.7
19	Song [31]	2010	Mainland	Anhui	Southern	21.8	55.9	Yes	Q	BSSI	95.9	210	2062	10.2
20	Sun [32]	2010	Mainland	Shandong	Northern	20.4	42.4	No	Q	BSSI	94.3	228	1886	12.1
21	Yang [33]	2010	Mainland	Harbin	Northern	21.3	51.1	No	Q	SMQ	87.8	479	5240	9.1
22	Yan [34]	2009	Mainland	Guangdong	Southern	21.2	46.8	No	Q	SMQ	87.2	57	772	7.4
23	Shi [35]	2007	Mainland	Guangdong	Southern	20.6	49.8	No	Q	SMQ	98.0	297	2564	11.6
24	Shi [36]	2013	Mainland	Guangxi	Southern	20.4	52.7	No	Q	BSSI	91.0	434	2730	15.9
25	Ran [37]	2006	Mainland	Sichuan	Southern	-	70.6	No	Q	UPI	100.0	229	8850	2.6
26	Kan [38]	2013	Mainland	Zhejiang	Southern	-	46.1	No	Q	UPI	99.9	263	10138	2.6
27	Zhao [39]	2011	Mainland	Guangdong	Southern	21.7	56.6	No	Q	SMQ	96.35	98	1450	6.8
28	Yin [40]	2009	Mainland	Jiangsu	Southern	21.3	36.4	No	QI	SMQ	95.7	90	670	13.4
29	Yang [41]	2007	Mainland	Henan	Northern	16–24	74.6	No	Q	SCL-90	93.9	705	3568	19.8
30	Liu [42]	2013	Mainland	Guangdong	Southern	14–25	58.5	No	Q	SPS	100.0	585	6154	9.5
31	Tu [43]	2013	Mainland	Guangdong	Southern	21.0	60.0	No	Q	UPI	100.0	144	11603	1.24
32	Liu [44]	2008	Mainland	Beijing	Northern	-	42.5	Yes	Q	SMQ	91.4	125	1204	10.4
33	Li [45]	2008	Mainland	Beijing	Northern	20.0	55.6	No	Q	BSSI	97.6	166	2055	8.1
34	Cao [46]	2009	Mainland	Anhui	Southern	19.3	46.2	Yes	QI	BSSI	91.8	1669	10344	16.4
35	Fan [47]	2008	Mainland	Anhui	Southern	20.3	53.5	Yes	Q	BSSI	94.4	496	3517	14.1
36	Tang [48]	2011	Mainland	Hubei	Southern	10–24	54.7	No	Q	SMQ	100.0	178	2013	8.8
37	Zhang [49]	2012	Mainland	Guangdong	Southern	21.8	48.6	No	Q	SMQ	87.2	137	689	19.9
38	Zhu [50]	2011	Mainland	Jiangsu	Southern	19.6	47.1	No	Q	BSSI	98.1	430	2374	18.1
39	Zhao [51]	2012	Mainland	Guangdong	Southern	19.5	46.4	No	Q	BSSI	84.0	225	1168	19.3
40	Wang [52]	2010	Mainland	Shanxi	Northern	19.0	46.9	No	Q	UPI	93.0	46	882	5.6
41	Gau [53]	2008	Taiwan	Taiwan	Southern	19.4	48.5	No	Q	SMQ	79.2	759	2919	26.0

Screen methods: Q, questionnaire distribution; QI, questionnaire-based interview. Screening tools: UPI, University Personality Inventory, SMQ, Self-made scale; CIDI, Composite International Diagnostic Interview; BSSI, Beck Scale for Suicide Ideation-Chinese Version.