Table 4—

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

Predictors	Area	se	p-value	95% CI of area	Cut-off point^¶	Sensitivity	Specificity	Positive predictive value	Negative predictive value	Likelihood ratio of a positive test result	Likelihood ratio of a negative test result
GOLD stages	0.823	0.035	<0.001	0.76–0.89	III	0.80	0.75	0.69	0.85	3.25	0.26
BODE score	0.796	0.036	<0.001	0.73–0.87	3	0.67	0.79	0.69	0.78	3.23	0.42
FEV_{1 % pred}	0.795	0.036	<0.001	0.73–0.87	54	0.80	0.71	0.65	0.84	2.78	0.28
6MWD m	0.773	0.037	<0.001	0.70–0.85	44	0.79	0.74	0.68	0.84	3.06	0.29
MMRC grade	0.768	0.037	<0.001	0.70–0.84	2	0.65	0.78	0.67	0.77	3.01	0.44

CI: confidence interval; GOLD: Global Initiative for Chronic Obstructive Lung Disease; BODE: body mass index, airway obstruction, dyspnoea, exercise capacity; FEV_1: 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.