Fig. 2
Meta-analyses of annualized rate of FEV1 decline by body mass index (BMI) category. Individual meta-analyses presented for each BMI category from lowest (BMI-I) to highest (BMI-IV). Data from randomized controlled trials: SUMMIT, Calverley et al [17]; TIOSPIR, Anzueto et al [20]; TORCH, Celli et al [16]; UPLIFT, Tashkin et al. [19] FEV1, forced expiratory volume in 1 s; CI, confidence interval; I2, heterogeneity statistic; p, significance from Cochran’s Q test of heterogeneity