Table 3– Overview of intercepts and predicted 1-yr increase using longitudinal models in all domains of St George’s Respiratory Questionnaire (SGRQ) and Groningen Activities of Daily Living Restriction Scale (GARS) for all severity subgroups separately
Subgroups based on total scores at baselineIntercept (95% CI)Predicted 1-yr increase (95% CI)
SGRQ
 Symptoms
  Low45.4 (39.3–51.5)3.7 (-2.9–10.3)
  Intermediate59.9 (56.0–63.7)3.1 (-1.6–7.8)
  High74.3 (68.3–80.4)2.4 (-5.8–10.6)
 Activity
  Low73.3 (70.2–76.5)5.6 (2.5–8.8)
  Intermediate84.1 (82.1–86.1)2.9 (0.5–5.2)
  High95.0 (91.8–98.1)0.1 (-4.0–4.2)
 Impacts
  Low36.6 (33.3–39.9)7.0 (3.0–11.1)
  Intermediate56.2 (54.1–58.3)4.5 (1.5–7.5)
  High75.9 (72.5–79.2)1.9 (-3.4–7.3)
 Total
  Low49.6 (46.8–52.3)6.0 (3.2–8.8)
  Intermediate65.5 (63.8–67.2)3.8 (1.7–5.9)
  High81.4 (78.7–84.2)1.6 (-2.2–5.3)
GARS
 ADL
  Low13.9 (13.1–14.7)1.0 (0.2–1.9)
  Intermediate18.3 (17.8–18.8)1.0 (0.4–1.6)
  High22.7 (22.0–23.4)1.1 (0.1–2.0)
 IADL
  Low12.2 (11.6–12.8)0.9 (0.2–1.6)
  Intermediate15.9 (15.5–16.3)0.4 (-0.1–0.8)
  High19.6 (19.0–20.1)-0.2 (-1.0–0.6)
 Total
  Low26.1 (25.0–27.2)2.3 (1.1–3.5)
  Intermediate34.2 (33.5–34.9)1.7 (0.8–2.5)
  High42.2 (41.1–43.3)1.1 (-0.3–2.5)
  • ADL: activities of daily living; IADL: instrument ADL.