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Demographic and Validating Variables Not Used in Cluster Analysis
| Variables not used in cluster analysis | Cluster 1 (n = 27) | Cluster 3 (n = 67) | Cluster 4 (n = 18) | Cluster 5 (n = 41) | Chi-square (df = 3) | P value |
|---|---|---|---|---|---|---|
| Sex (% male) | 51.9 | 62.7 | 44.4 | 85.4 | 12.97 | 0.005 |
| Ethnicity (% Caucasian) | 96.3 | 76.1 | 88.9 | 73.2 | 7.29 | 0.06 |
| Early age at onset (% ≤ 21 years) | 70.4 | 64.2 | 44.4 | 53.7 | 4.20 | 0.24 |
| Congenital heart defect | 22.2 | 1.82 | 7.69 | 0 | 14.39 | 0.002 |
| Mild mental retardation | 33.3 | 6.7 | 42.9 | 6.1 | 20.2 | 0.001 |
