Fig. 9From: Adding non-randomised studies to a Cochrane review brings complementary information for healthcare stakeholders: an augmented systematic review and meta-analysisLung function (FEV1 or PEF, in % predicted value or L/min), forest plot by study design. RCT: randomised controlled trial; QRCT: quasi randomised controlled trial; BA: before-after study (without external control group); INT: intervention; CON: control; SD: standard deviation; IV: inverse variance; CI: confidence intervalBack to article page