IL4 and periodontitis: Meta-analysis of the IL-4 70-bp VNTR showed no association between the polymorphism and periodontitis susceptibility (2 versus 1: OR = 1.67, 95% CI = 0.71–3.96; 22 versus 11: OR = 1.39, 95% CI = 0.56–3.42; 12 versus 11: OR = 1.0, 95% CI = 0.43–2.31; 22 + 12 versus 11: OR = 1.09, 95% CI = 0.48–2.50; 22 versus 11 + 12: OR = 1.61, 95% CI = 0.89–2.93).