Mean change in lung function over the previous 20 years by snoring and nocturnal gastro-oesophageal reflux (nGOR) at follow-up

No snoringWith snoringNo nGORWith nGOR
Between ECRHS I and III (∼20 years)
 Change in pre-bronchodilator FEV1 % pred−4.66±10.26−6.22±10.54−4.86±10.29−6.08±11.00
 Change in pre-bronchodilator FEV1 mL·year−1−34.78±18.31−38.29±19.06−35.30±18.35−36.89±20.22
 Change in pre-bronchodilator FVC % pred−0.91±9.54−2.57±9.39−1.15±9.51−2.04±9.80
 Change in pre-bronchodilator FVC mL·year−1−26.41±21.74−31.00±21.68−27.09±21.70−29.93±22.93
Between ECRHS II and III (∼10 years)
 Change in pre-bronchodilator FEV1 % pred−4.53±8.55−6.34±9.05−4.78±8.68−5.43±8.40
 Change in pre-bronchodilator FEV1 mL·year−1−41.99±25.59−47.75±27.61−42.82±25.90−44.41±26.62
 Change in pre-bronchodilator FVC % pred−0.94±8.82−2.82±8.91−1.2±8.88−1.69±8.97
 Change in pre-bronchodilator FVC mL·year−1−32.16±33.07−39.15±33.65−33.14±33.36−35.43±32.84

Data are presented as mean±sd. ECRHS: European Community Respiratory Health Survey; FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity.