Table 2.

Odds ratio of GOLD classification and CAT groups for each severity of depression

^*Depression is defined as a PHQ-9 score of ≥10 in the present study; ^†By multi-nominal logistic regression analyses; ^‡Goodness-of-fit test: Chi-square=2.913 and P=0.820. CAT, COPD assessment test; CI, confidence interval; GOLD, global initiative for chronic obstructive lung disease; OR, odds ratio; PHQ-9, Patient Health Questionnaire-9.