Table 1.

Baseline characteristics and methodological qualities of all included studies.

First author	Year	Country	Ethnicity	Sample	Sample size	Number		Gender (M/F)	Age (years)	Method	NOS score
						Positive	Negative
Le Guellec [19]	2013	France	Caucasians	36	Small	11	24	19/17	18 (8~57)	LSAB	7
Shen [22]	2008	China	Asians	56	Large	38	18	29/27	22 (7~67)	Envision	8
Salas [23]	2007	France	Caucasians	37	Small	23	14	23/14	15 (7~54)	ABC	7
Kim [15]	2007	Korea	Asians	64	Large	33	31	45/19	19 (4~58)	SP	8
Min [21]	2012	China	Asians	82	Large	49	33	44/38	19 (7~62)	SP	8
Xiong [20]	2011	China	Asians	42	Large	26	16	25/17	42 (10~77)	MaxVision	8
Yang [24]	2010	China	Asians	54	Large	22	32	35/19	23 (12~49)	SP	8
Park [14]	2009	Korea	Asians	31	Small	6	25	15/16	39	ABC	7
Yang [25]	2008	China	Asians	36	Small	20	16	20/16	10~50	SP	7
McHugh [26]	2006	USA	Caucasians	21	Small	11	10	11/10	—	LSAB	6

M: male; F: female; LSAB: labelled streptavidin biotin; ABC: avidin-biotin-peroxidase complex; SP: streptavidin-perosidase.