Figure 2
From: Poor sleep quality, COPD severity and survival according to CASIS and Pittsburgh questionnaires
Kaplan–Meier survival curves according to sleep quality assessed by PQI or CASIS questionnaires.
Figure 2 | Scientific Reports
From: Poor sleep quality, COPD severity and survival according to CASIS and Pittsburgh questionnaires
Kaplan–Meier survival curves according to sleep quality assessed by PQI or CASIS questionnaires.
