Table 1

Follow-up schedule

Item/time	Baseline assessment	Third month	Sixth month	Ninth month	Twelfth month
Follow-up approach	Field investigation	Field investigation or telephone	Field investigation or telephone	Field investigation or telephone	Field investigation
COPD-PS	√
STOP-Bang	√
Berlin Questionnaire	√
Epworth Sleepiness Scale	√
CAT	√	√	√	√	√
mMRC	√	√	√	√	√
St George’s Quality of Life Questionnaire	√	√	√	√	√
Combinations	√	√	√	√	√
Medications or therapy	√	√	√	√	√
Oxygen therapy	√	√	√	√	√
Lung function	√	√	√	√	√
Sleep monitoring indicators	√	√	√	√	√
Events of AECOPD during the last 3 months	√	√	√	√	√
Incidence of AECOPD during the last 3 months	√	√	√	√	√
Visits to healthcare or hospitalisations for AECOPD	√	√	√	√	√
Medical cost related to COPD or sleep breathing disorders	√	√	√	√	√
Referral		√	√	√	√
Withdrawal		√	√	√	√

AECOPD, acute exacerbation of COPD; CAT, COPD Assessment Test mMRC: Modified British Medical Research Council; COPD, chronic obstructive pulmonary disease; COPD-PS, the Self-Scored COPD Population Screener Questionnaire; STOP-Bang, Snoring, Tired, Observed, Pressure, BMI, Age, Neck, Gender.