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Table 1 Odds ratios for participation according to study characteristics

From: Reporting participation rates in studies of non-pharmacological interventions for patients with chronic obstructive pulmonary disease: a systematic review

Variable Odds ratio (95% confidence interval) P  
Year 0.99 (0.92, 1.08) 0.891  
Quality score 0.85 (0.65, 1.10) 0.215  
Exercise intervention 1.55 (0.47, 5.07) 0.470  
Group intervention    0.506 (trend)
 Individual 1.00 -   
 Combination 0.17 (0.03, 0.81)   
 Group 0.60 (0.17, 2.11)