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Table 4 Logistic regression analyses with COPD severity at baseline as independent variable and sleep disturbance at 2-year follow-up as dependent variable

From: Longitudinal associations between sleep disturbance and disease severity in patients with COPD

 OR (95% CI)p-value
FEV1 pp0.98 (0.96, 1.00)0.05
mMRC1.77 (1.16, 2.68)0.008
SGRQ1.04 (1.01, 1.06)0.004
ISWT distance0.99 (0.99, 1.00)0.04
RV pp1.01 (0.99, 1.02)0.38
DLCO pp0.98 (0.96, 0.99)0.03
  1. Note: All analyses control for age sex, race, body mass index, and smoking. Each COPD severity variable above was used as an independent variable in its own multivariable logistic regression analysis. FEV1pp.forced expiratory volume in 1 s percent predicted, mMRC modified Medical Research Council scale, SGRQ St. George’s Respiratory Questionnaire, ISWT Incremental shuttle walk test, OR odds ratio, 95% CI 95% confidence interval, RV pp. residual capacity percent predicted, DLCO pp. diffusion capacity for carbon monoxide percent predicted