From: The Darlington and Northallerton Long Term Asthma Study: pulmonary function
Age Excluded | Age Included | ||||
---|---|---|---|---|---|
Coefficient | p | Coefficient | p | ||
Gender (male v female) | 5.5 (4.8) | 0.25 | 5.7 (4.7) | 0.23 | |
Asthma since childhood | 13.5 + (5.1) | 0.008 | 4.9+ (5.8) | 0.40 | |
Social Classes 1 & 2 (v. classes 4 & 5) | 4.8 (5.4) | 0.65 | 1.8 (5.4) | 0.88 | |
Social Class 3 (v. classes 4 & 5) | 1.1 (5.1) | 0.6+ (5.0) | |||
Amount smoked (per 10 pack years) | 1.8 (1.2) | 0.13 | 1.0 (1.2) | 0.39 | |
Best PEF(per 10% deficit) | 1.2+ (1.2) | 0.33 | 0.9+ (1.2) | 0.41 | |
Actual/Best PEF(10% deficit) | 12.0 + (1.6) | <0.0001 | 13.2 + (1.6) | <0.0001 | |
Age at entry (per decade) (difference from age 50) | Linear | 3.5+ (3.1) | |||
quadratic | 4.9+ (0.9) | ||||
cubic | 1.2 (0.6) | 0.02 | |||
Duration of asthma at entry (per decade) (difference from duration 20 yrs) | Linear | 1.3 (2.8) | 2.0+ (2.4) | ||
quadratic | 3.2 (1.5) | 0.9 (0.5) | |||
cubic | 0.85 + (0.38) | 0.03 | 2.5+ (0.39) | 0.52 |