Table 1.

Characteristics of studies, numbers of women with invasive cervical cancer (cases) or normal cytology (controls)

First author, year [reference]	Country	Study design	Cases, n		Controls, n
			HPV+	Total	HPV+	Total
Abba, 2003 [30]	Argentina	Cross-sectional	21	21	70	152
Alibegashvili, 2011 [31]	Georgia	Case–control	91	91	143	1,247
An, 2003 [32]	South Korea	Cross-sectional	48	50	72	276
Andersson, 2005 [33]	Sweden	Cross-sectional	45	45	24	24
Asato, 2004 [34]	Japan	Case–control	311	356	333	3,249
Baay, 2001 [35]	Belgium	Case–control	101	115	31	286
Bardin, 2008 [36]	Poland	Case–control	87	88	115	799
Castellsagué, 2008 [37]	Mozambique	Case–control	230	241	148	195
Chang, 1997 [38]	China	Case–control	39	47	42	72
Chaouki, 1998 [39]	Morocco	Case–control	144	152	38	185
Cho, 2003 [40]	South Korea	Cross-sectional	43	49	132	414
Ferrera, 1999 [41]	Honduras	Case–control	83	104	170	438
Hammouda, 2011 [42]	Algeria	Case–control	167	171	39	732
Herrero, 2005 [43]	Costa-Rica	Cross-sectional	34	35	1,671	7,459
Hong, 2008 [44]	China	Case–control	172	181	91	217
Illades-Aguiar, 2009 [45]	Mexico	Case–control	133	133	91	256
Illades-Aguiar, 2010 [46]	Mexico	Cross-sectional	141	141	1,274	3,117
Keita, 2009 [47]	Guinea	Case–control	70	77	360	752
Lee, 2007 [48]	South Korea	Cross-sectional	133	160	388	1,650
Liu, 2010 [49]	China	Case–control	111	134	274	613
Maehama, 2005 [50]	Japan	Case–control	330	383	434	4,078
Park, 2004 [51]	South Korea	Cross-sectional	59	62	51	290
Sasagawa, 2001 [52]	Japan	Case–control	75	84	151	1,562
Sherpa, 2010 [53]	Nepal	Case–control	54	61	73	898
Tachezy, 1999 [54]	Czech Republic	Cross-sectional	36	49	38	165
Tornesello, 2006 [55]	Italy	Case–control	53	65	36	183
Wu, 2010 [56]	China	Cross-sectional	91	96	61	314
Total			2,902	3,191	6,350	29,623

HPV+, human papillomavirus-positive.