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Forced expiratory volume in one second (FEV1) is inversely associated with mortality in Western populations, but few studies have assessed the associations of peak expiratory flow (PEF) with subsequent cause-specific mortality, or have used populations in developing countries, including China, for such assessments.

Peak flow as a predictor of cause-specific mortality in China: results from a 15-year prospective study of ∼170 000 men