Table 1

Characteristics and stratified data of the included studies

							Subgroup
First author and year published	Survey year	Type (special investigation/contains relative data)	Location	Methods of random sampling	Female (%)	Age	Male	Female	15–59 years	≥60 years	Urban	Rural
Yang et al (2015)15	2010	Special	Province	Cluster	64	60–95	130/668	417/1203		547/1871	547/1871
Chinese CDC (2014)43	2010	Relative	National	Multistage	66	≥60	1434/5085	3306/9923		4470/15 008
Cai et al (2014)33	2010	Special	Province	Multistage	77	≥18	1031/2699	3859/8892	3655/8447	1235/3144		4890/11 591
Chen et al (a) (2014)32	2008–2010	Special	Province	Multistage	100	45–65		12 730/27 874	11 457/25 033	1273/2843	12 730/27 874
Chen et al (b) (2014)68	2013	Relative	Province	Multistage	68	15–69	64/179	189/371
Li et al (a) (2014)31	2011	Special	Province	Multistage	71	≥18	162/227	345/549
Li et al (b) (2014)30	2011	Special	Province	Multistage	75	≥18	266/717	856/2124	758/1897	190/483		1122/2841
Qi et al (2014)29	2012	Special	Province	Multistage	77	15–74	1110/3055	4297/10 177	4692/11 185	169/623
Wang et al (2014)58	2011	Relative	Province	Multistage	65	≥18	1905/4045	4090/7411	5238/9786	661/1670	1855/3291	4420/7486
Yan et al (2014)57	2012	Relative	Province	Multistage	67	15–69	140/522	417/1044			321/700	373/866
Li, S.J et al (2013)54	2011	Relative	Province	Multistage	81	≥18	230/558	1070/2279	2813/3629			1300/2837
Fan et al (2013)69	2010	Relative	Province	Multistage	71	15–69	107/166	202/417
Li et al (2013)45	2012	Relative	Province	Multistage		15–69
Liu et al (2013)34	2012	Special	Province	Multistage	65	≥15	113/262	233/491	322/653	–	346/753
Wu et al (2013)70	2010	Relative	Province	Multistage	66	≥18	69/144	141/285	182/366	28/63
Zhang et al (2013)35	2010	Special	Province	Multistage	67	15–69	413/1293	1171/2901	1525/3967	59/227		1584/4194
Cai, L. et al (2012)37	2010	Special	Province	Multistage	78	≥18	901/1289	3469/4567		775/1194		4370/5856
Feng et al (2012)52	2010	Relative	Province	Multistage	66	≥15	156/257	295/508	403/687		551/765
Han et al (2012)56		Relative	Province	Multistage	88	≥18	26/104	309/794				335/898
Huang et al (2012)51	2010	Relative	Province	Multistage	68	15–65	50/103	77/221			127/324
Li et al (2012)47	2010	Relative	Province	Cluster	62	35–86	35/84	62/138			97/222
Sun et al (2012)50	2010	Relative	Province	Stratified	81	≥18	76/183	248/748	266/589	58/159		324/931
Wang et al (a) (2012)71	2010	Relative	Province	Multistage	74	15–69	131/415	501/1159	464/1122	27/93
Wang et al (b) (2012)55	2010	Relative	Province	Multistage	68	≥15	582/1521	1258/3197	1605/3914	235/804		1840/4718
Wei et al (2012)46	2010	Relative	Province	Cluster	61	≥15	99/220	134/345			233/565
Xu et al (2012)36	2010	Special	Province	Multistage	69	≥15	293/467	613/1047			513/821	420/806
Feng et al (2011)62	2010	Relative	Province	Multistage	99	≥18	1/5	243/440
Meng et al (2011)59	2007	Relative	Province	Multistage	66	15–69	254/853	519/1647			417/1118	356/1380
Chinese CDC (2010)18	2007	Relative	National	Multistage	72	15–69	3632/9879	10 546/26 145	12 116/69 768	1384/4659	5470/14 341	8708/21 683
GATS China (2010)6	2010	Special	National	Multistage	69	≥15	2045/2760	4514/6305
Chinese CDC (2009)38	2004	Special	National	Multistage	79	18–69	1501/4842	6016/17 747	6243/17 929	612/2519	3047/8809	4470/13 780
Chen et al (2009)72	2007	Relative	Province	Multistage	77	15–69	207/585	727/1950
Zhou et al (2009)16	2008	Relative	Province	Stratified	79	≥15	107/135	457/518			564/653
Wang et al (2008)17	2004	Special	Province	Multistage	71	18–69	646/2358	1673/5784	2022/7079	211/1063		2391/8142
Jiang et al (2007)48	2004–2005	Relative	Province	Cluster		≥18						11 037/15 110
Su et al (2007)53	2006	Relative	Province	Multistage	74	≥18	519/727	730/2068	1240/2523	81/272	1249/2795
Wang et al (2007)60	2004	Relative	Province	Multistage	64	15–69	792/2100	1641/3699			1268/3054	1222/2244
Han et al (2006)40	2002	Special	Province	Multistage	100	15–94		2886/3500			2886/3500
Huang et al (2006)49	2002	Relative	Province	Cluster	93	≥40	298/354	3895/5300	1559/2201	500/1192		3393/5654
Ying et al (2006)39	2002	Special	Province	Multistage	100	15–86		814/1000	619/753	81/110	814/1000
Zhang et al (2006)61	2002	Relative	Province	Multistage	69	≥15	437/2184	1823/4899	1908/5789	310/1242	1768/3850	1441/3764
Ma et al (county team)(2006)44	2002	Relative	National	Multistage	70	≥15	9957/38 167	47 946/87 975	43 136/102 170	6108/21 021	29 236/47 792	56 699/89 991
Yang et al (2005)41	2002	Special	National	Multistage	74	15–69	1323/2780	4169/7635
Yao et al (2002)42	1999	Special	Province	Unclear	66	≥18	292/1244	750/2389	992/3369	70/264	1042/3633
Wen et al (1999)73	1996	Relative	Province	Multistage		≥15
Lin et al (1997)74	1995	Relative	Province	Multistage	75	15–69	468/1193	1537/3641