1.

纳入研究的基本特征

General characteristics of included trials

First author	Cases	Controls	Study type	OR	95%CI	Adjusted OR	Adjusted 95%CI	Years of data Collection	Year of publicaion	Region
HU[3]	104	163	Case-control	2.86	1.72-4.76	—	—	1990-1993	1996	Guangdong
ZHENG[4]	94	259	Case-control	1.04	0.61-1.78	1.04	0.59-1.85	1990-1993	1997	Peking
Zhong[5]	504	601	Case-control	1.15	0.85-1.57	1.1	0.8-1.5	1992-1994	1999	Shanghai
Gao[6]	246	375	Case-control	1.19	0.82-1.73	1.30	0.87-1.94	1984-1986	1987	Shanghai
Ko[7]	105	105	Case-control	0.86	0.46-1.60	0.8	0.4-1.6	1992-1993	1997	Taiwan
Wu-Williams[8]	417	602	Case-control	0.78	0.56-1.10	0.70	0.60-0.90	1985-1987	1990	Shenyang
Wang[9]	228	521	Case-control	1.39	0.88-2.20	1.19	0.7-2.0	1994-1998	2000	Gansu
McGhee[10]	324	763	Case-control	1.62	1.24-2.13	1.39	1.03-1.88	1983-1986	2005	Hong Kong
Liu[11]	54	202	Case-control	0.74	0.32-1.69	0.77	0.30-1.96	1985-1986	1991	Xuanwei
Lam[12]	199	335	Case-control	1.65	1.16-2.35	—	—	1983-1986	1987	Hong Kong
Lei[13]]	75	128	Case-control	1.19	0.66-2.16	—	—	—	1996	Guangzhou
SUN[14]	230	230	Case-control	4.18	2.14-8.16	2.86	1.69-4.84	1985-1991	1995	Haerbin
Lee[15]	268	445	Case-control	1.88	1.36-2.60	—	—	1992-1998	2000	Taiwan
LIU[16]	498	595	Case-control	1.93	1.31-2.83	1.65	1.10-2.47	1992-1993	2001	Shanghai
SONG[17]	115	124	Case-control	2.31	1.36-3.90	—	—	—	1999	Haerbin
LIN[18]	122	122	Case-control	1.20	0.60-2.39	—	—	1985-1990	1994	Haerbin
Combined	3 583	5 570		1.13	1.05-1.21