Difference in outcome measures at 12-month follow-up, intention-to-treat analysis: control versus intervention
| Outcome | At study entry | 12 months after intervention | Difference (95% CI) | |||
| Intervention group | Control group | Intervention group | Control group | Unadjusted | Adjusted for baseline score | |
| NHER | 5.1 | 5.5 | 5.5 | 5.7 | 0.2 (-0.5–0.9) | 0.2 (-0.1–0.6) |
| EAFC £ | 696 | 533 | 647 | 580 | -66.9 (-250.2–116.4) | -12.1 (-52.4–28.7) |
| LR h at 21°C | 55.9 | 73.1 | 59.4 | 64.0 | 4.6 (-19.2–28.3) | 7.4 (-11.0–25.8) |
| BR h at 18°C | 100.2 | 109.5 | 111.9 | 102.2 | -9.7 (-36.4–17.0) | 22.4 (1.6–43.4) |
| LR average humidity g·kg−1 | 46.4 | 60.0 | 43.8 | 43.0 | -0.9 (-4.8–3.0) | -1.7 (-4.9–1.6) |
| BR average humidity g·kg−1 | 50.0 | 65.4 | 49.5 | 48.7 | -0.8 (-4.3–2.7) | -0.8 (-3.5–1.9) |
| COPD admissions n | 1.1 | 1.1 | 1.5 | 1.1 | -0.4 (-1.2–0.4) | 0.4 (-0.4–1.1) |
| Symptom score# | 73.8 | 76.5 | 73.2 | 77.1 | -3.8 (-12.4–4.8) | -3.5 (-11.3–4.3)¶ |
| Impact score# | 56.7 | 57.1 | 61.0 | 58.8 | 2.1 (-6.8–11.0) | 3.0 (-4.3–10.2)¶ |
| Activities score# | 85.5 | 83.0 | 83.5 | 82.6 | 0.9 (-6.9–8.7) | -1.4 (-7.7–4.8)¶ |
| SGRQ total | 68 | 68 | 69.8 | 68.9 | -0.9 (-8.5–6.6) | -0.9, (-6.7–4.9) |
| VAS score | 50.3 | 47.1 | 48.5 | 48.5 | 0.0 (-1.0–1.0) | -0.3 (-1.2–0.6)¶ |
NHER: National Home Energy Rating; EAFC: estimated annual fuel costs; LR: living room; BR: bedroom; COPD: chronic obstructive pulmonary disease; SGRQ: St George’s Respiratory Questionnaire; VAS: visual analogue scale. #: score from SGRQ; ¶: adjusted for baseline score, age, % predicted forced expiratory volume in 1 s and mass of particles <2.5 μm in diameter.