Table 2. Stratified analyses of RARβ2 methylation and prostate cancer risk.

Variables	pa		OR		95% CI		Heterogeneity
							X2		P		I2
RARβ2
total		12		63. 44		23.94–168.11		33.47		0. 001		67.1%
total (trim-and-fill)		12		17.62		6.30–49.28		85.27		0.001		-
material
Non-tissue		3		46. 76		2.68–817.26		23. 18		0. 001		34.3%
Tissue		9		67.85		33. 75–136.42		5.11		0. 746		0. 0%b
method
QMSP		6		47. 10		10.59–209.53		27.56		0. 001		81.9%
MSP		6		89. 15		31.93–248.90		2.05		0. 842		0. 0%b

^aNumber of comparisons.

^bBetween group heterogeneity not calculated; only valid with inverse variance method.