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Fig. 3 | Respiratory Research

Fig. 3

From: Assessment of comorbidities and prognosis in patients with COPD diagnosed with the fixed ratio and the lower limit of normal: a systematic review and meta-analysis

Fig. 3

Forest plot of exacerbation for different diagnostic criteria, compared with those met neither (FR+/LLN+: FEV1/FEV < 0.7 and FEV1/FVC < LLN, FR+/LLN-: FEV1/FEV < 0.7 but FEV1/FVC > LLN, FR−/LLN+: FEV1/FEV ≥ 0.7 but FEV1/FVC < LLN)

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