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Fig. 9 | BMC Health Services Research

Fig. 9

From: Adding non-randomised studies to a Cochrane review brings complementary information for healthcare stakeholders: an augmented systematic review and meta-analysis

Fig. 9

Lung 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 interval

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