Fig. 4

Forest Plot for prolonged hospitalization (Top) and discharge to an intermediate care facility (Bottom). Individual study and pooled unadjusted risk ratios (RRs) of frail vs non-frail patients undergoing primarily CABG and valve surgery. The pooled RRs with 95% CI were calculated using random-effects models. Sensitivity Analyses – Risk of prolonged hospital stay also higher if study with largest weighting is excluded [6]: RR1.69, 95%CI:1.34–2.13, p < 0.0001, I² = 0%. Adjusted risk of discharge to intermediate care facility is also higher if study with largest weighting is excluded [6]: adj OR 3.16, 95%CI:1.66–6.02, p = 0.0005, I² = 0%