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Definition of abbreviations: COPD = chronic obstructive pulmonary disease; GOLD = Global Initiative for Chronic Obstructive Lung Disease (GOLD grade based on GOLD 2015 guidelines); INCA = inhaler compliance assessment; MRC = Medical Research Council.Data are presented as mean (SD) unless otherwise stated.Comparison of characteristics across adherence clusters was performed using an unpaired t test or ANOVA for multiple comparisons.A chi-squared test was used for the comparison of proportional data.*P , 0.05 compared with cluster 1. † P , 0.01 compared with cluster 1.
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Cushen et al. (2018) studied this question.
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