Fig. 4From: Conventional laboratory housing increases morbidity and mortality in research rodents: results of a meta-analysisRandom-effects meta-analysis of housing effects showing  overall standardized mean difference (SMD [Hedge’s G]) and 95% confidence intervals of cardiovascular disease studies. Blue diamond = SMD estimate (with the width reflecting the 95% CI), location of black squares indicates study SMD and size indicates the weight of the study in the meta-analysis. CH = conventional housing, EH = ‘enriched’ housing, RE = random effects. I2 and Q statistic are tests of heterogeneity. Results of the model testing whether SMDs are significantly different from zero: n = 10, z = 4.36, p = 0.0018Back to article page