Table 4—

Receiver operating characteristic curves for prediction of very inactive# patients with chronic obstructive pulmonary disease

PredictorsAreasep-value95% CI of areaCut-off pointSensitivitySpecificityPositive predictive valueNegative predictive valueLikelihood ratio of a positive test resultLikelihood ratio of a negative test result
GOLD stages0.8230.035<0.0010.76–0.89III0.800.750.690.853.250.26
BODE score0.7960.036<0.0010.73–0.8730.670.790.690.783.230.42
FEV1 % pred0.7950.036<0.0010.73–0.87540.800.710.650.842.780.28
6MWD m0.7730.037<0.0010.70–0.85440.790.740.680.843.060.29
MMRC grade0.7680.037<0.0010.70–0.8420.650.780.670.773.010.44
  • CI: confidence interval; GOLD: Global Initiative for Chronic Obstructive Lung Disease; BODE: body mass index, airway obstruction, dyspnoea, exercise capacity; FEV1: forced expiratory volume in one second; % pred: % predicted; 6MWD: 6-min walk distance; MMRC: modified Medical Research Council dyspnoea scale. #: defined as a physical activity level <1.40, including 66 patients with COPD (40.5% of all COPD patients); : equal or greater than.