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Estimated effects (and 95% confidence intervals) of insulin use for 1–5 years on % predicted forced expiratory volume in 1 s (FEV1 %) for the whole cohort (“no interaction”) and for people with high, moderate or low FEV1 % at baseline. High, moderate and low FEV1 % were defined as 100, 75 and 40, respectively. IPTW: inverse-probability-of-treatment weighting.
