Table 2.
Clustering results
| Variable | Cluster 1 | Cluster 2 | Cluster 3 | Cluster 4 | Cluster 5 |
|---|---|---|---|---|---|
| (n = 170) | (n = 236) | (n = 62) | (n = 62) | (n = 81) | |
| Early atopic | Late onset female | Reversible | Smokers | Exacerbators | |
| Gender (%female) | 45.3 | 85.2 | 75.8 | 51.6 | 75.3 |
| Age, yr | 34.8 | 42.5 | 34.5 | 44.5 | 39.7 |
| Age of diagnose, yr | 13.7 | 27.1 | 16.5 | 23.5 | 18.5 |
| BMI, kg/m2 | 25.2 | 27.4 | 25.1 | 25.5 | 27.5 |
| ACQ6 | 0.5 | 0.9 | 1.7 | 1.0 | 1.6 |
| AQLQ | 6.3 | 5.6 | 5.3 | 5.8 | 5.1 |
| Reversibility, % | −1.8 | 2.7 | 35.1 | 10.7 | 10.9 |
| Pack years smoked, yr | 1.2 | 2.9 | 2.1 | 24.0 | 4.4 |
| Exacerbations in past 12 months, no per patient | 0.1 | 0.4 | 0.5 | 0.4 | 3.0 |
| FEV1 (% predicted) | 96 | 100 | 70 | 89 | 99 |
| Factorsa | |||||
| SES | 0.20 | 0.01 | −0.16 | −0.48 | 0.03 |
| Allergy | 0.27 | −0.20 | 0.05 | −0.33 | 0.22 |
| Functioning | 0.42 | −0.18 | −0.16 | 0.15 | −0.37 |
| Medication | −0.38 | 0.18 | 0.05 | 0.01 | 0.24 |
a Factor scores are standardised Z-scores with mean = 0 and standard deviation = 1