BMC Medical Research Methodology

Table 2 Meta-analysis of the association of the CYP1A1 MspI polymorphism and smoking with the risk of renal cell carcinoma

From: Advanced stratification analyses in molecular association meta-analysis: methodology and application

Meta-analysis	No. of studies	CYP1A1 MspI	Non-smokers					Smokers
Meta-analysis	No. of studies	CYP1A1 MspI	Cases	Controls	OR	95%CI	P	Cases	Controls	OR	95%CI	P
Meng F et al., 2015 [6]	2	Wt/Wt	75	205	1 (reference)		NA	67	128	1.43	0.96–2.13	0.08
Meng F et al., 2015 [6]	2	Wt/Vt + Vt/Vt	92	119	2.11	1.44–3.09	< 0.001	90	73	3.37	2.24–5.06	< 0.001

Note: OR odds ratio, CI confidence interval, NA not available, CYP1A1 cytochrome P450 1A1

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