Table 2—

Health related quality of life according to St. George's Respiratory Questionnaire (SGRQ), change in forced expiratory volume in one second (FEV1) and response to four quality of life questions at 12 month follow-up

Control groupIntervention groupDifference95% CI for the differenceORp-value
Subjects n3932
SGRQ total scores at the one year follow-up36.5±1820.2±1516.38.2–24.40.0002
FEV1 change in mL−83±38112±3919511–3770.038
FEV1 change in %−2.7±123.4±136.10.2–12.10.043
Percentage answering that  they had
 A better year43811.8–
 Symptom free days36812.4–
 Symptom free nights60942.0–
 No impact on daily life62881.2–
  • Data are presented as mean±sd

  • CI: confidence interval

  • independent-samples t-test

  • Chi-squared test

  • OR: odds ratio