Distribution of cohorts by cluster
| Cluster | Cohort | ||||||||||||||||
| Number | Mean severity | Main Gulf | Validation | Non-Gulf | Overall | ||||||||||||
| n | % | n | % | n | % | n | % | ||||||||||
| 1 | 1.0 | 1448 | 36.5 | 1469 | 36.3 | 1891 | 48.5 | 4808 | 40.4 | ||||||||
| 2 | 2.6 | 1104 | 27.8 | 1154 | 28.5 | 1161 | 29.8 | 3419 | 28.7 | ||||||||
| 3 | 4.6 | 462 | 11.6 | 458 | 11.3 | 462 | 11.8 | 1382 | 11.6 | ||||||||
| 4 | 5.0 | 462 | 11.6 | 475 | 11.7 | 177 | 4.5 | 1114 | 9.4 | ||||||||
| 5 | 7.7 | 333 | 8.4 | 339 | 8.4 | 145 | 3.7 | 817 | 6.9 | ||||||||
| 6 | 11.7 | 160 | 4.0 | 150 | 3.7 | 64 | 1.6 | 374 | 3.1 | ||||||||
| Overall | 3.1 | 3969 | 100.0 | 4045 | 100.0 | 3900 | 100.0 | 11914 | 100.0 | ||||||||