The adjusted* associations of respiratory disorders and sleep length for subjects with BMI <30 and subjects with BMI ≥30
| Short sleepers n=387 | Long sleepers n=217 | |||
| BMI <30 n=243 | BMI ≥30 n=144 | BMI <30 n=145 | BMI ≥30 n=72 | |
| Wheezing last 12 months | 1.37 (0.92–2.04) | 2.55 (1.53–4.26) | 0.89 (0.51–1.56) | 1.00 (0.48–2.12) |
| Woken with tight chest last 12 months | 2.16 (1.39–3.37) | 3.22 (1.75–5.94) | 1.02 (0.53–1.98) | 1.59 (0.70–3.62) |
| Shortness of breath while in rest last 12 months | 3.13 (1.74–5.63) | 1.37 (0.59–3.19) | 1.08 (0.38–3.07) | 1.58 (0.55–4.50) |
| Shortness of breath after activity last 12 months | 1.47 (0.96–2.26) | 2.33 (1.38–3.93) | 1.94 (1.19–3.18) | 1.48 (0.75–2.91) |
| Woken by shortness of breath last 12 months | 2.51 (1.45–4.35) | 2.48 (1.21–5.07) | 2.86 (1.43–5.72) | 0.87 (0.25–3.03) |
| Woken by coughing last 12 months | 1.24 (0.85–1.81) | 2.32 (1.40–3.85) | 1.07 (0.67–1.72) | 1.29 (0.66–2.54) |
| Cough in morning during the winter | 1.71 (1.06–2.74) | 2.45 (1.34–4.50) | 1.30 (0.68–2.47) | 2.38 (1.06–5.38) |
| Cough during day and night during the winter | 1.72 (1.11–2.65) | 2.32 (1.34–4.04) | 1.01 (0.54–1.89) | 0.84 (0.35–2.02) |
| Phlegm in morning during the winter | 1.79 (1.14–2.83) | 1.80 (1.00–3.25) | 1.44 (0.79–2.65) | 0.93 (0.36–2.39) |
| Phlegm during day and night during the winter | 1.91 (1.19–3.06) | 2.17 (1.15–4.09) | 0.84 (0.39–1.83) | 1.85 (0.78–4.39) |
| Asthma ever | 1.02 (0.60–1.75) | 1.27 (0.62–2.61) | 1.09 (0.58–2.07) | 2.78 (1.31–5.90) |
| nGOR | 2.16 (1.36–3.41) | 1.37 (0.75–2.49) | 1.26 (0.70–2.27) | 0.40 (0.13–1.18) |
| Chronic bronchitis | 1.50 (0.77–2.88) | 1.95 (0.97–3.95) | 1.45 (0.67–3.12) | 1.29 (0.42–3.94) |
| COPD | 1.50 (0.78–2.88) | 5.67 (1.62–19.8) | 1.45 (0.67–3.13) | 2.41 (0.46–12.7) |
| Nasal allergies including hay fever | 1.16 (0.77–1.73) | 1.26 (0.73–2.17) | 1.19 (0.74–1.90) | 0.94 (0.46–1.95) |
| Nose blocked for more than 12 weeks for the last 12 months | 2.59 (1.49–4.49) | 2.77 (1.31–5.84) | 1.40 (0.62–3.15) | 4.10 (1.67–10.08) |
*Adjusted for gender, age, centre, marital status, exercise and current smoking. Significance (p<0.05) is marked as bold. Logistic regression model. Normal sleep length was used as a reference group.
BMI, body mass index; COPD, chronic obstructive pulmonary disease; nGOR, nocturnal gastro-oesophageal reflux.