Figure 1
From: Validation of the Clinical COPD Questionnaire (CCQ) in primary care
Baseline SF-36 domain scores for the entire study sample, (n = 111, unfilled squares), COPD verified by spirometry (n = 83, filled triangles). National norm data (filled circles) for reference. pf = physical functioning, rp = role-physical, bp = bodily pain, gh = general health, vt = vitality, sf = social functioning, re = role-emotional, mh = mental health.