Table 4 Results of the second stage of two-stage clustering (described using the prevalence of first stage cluster membership)
Domain | Cluster 1 | Cluster 2 | |
|---|---|---|---|
Subgroup label | Uncertain of cause and fearful, but not heart-related - with local thoracic 5/6 palpation findings. | Believes pain to be heart- or musculoskelet-al-related with crushing pain, and local thoracic 2/3 signs and pectoral tenderness. | |
Cluster size | 51 % | 49 % | |
Cluster membership probability | Median (interquartile range) | 100 % (99 % to 100 %) | 100 % (98 % to 100 %) |
Demographic | Younger | 42 %* | 62 % |
Older | 58 % | 38 % | |
Previous history | 0 % | 0 % | |
Only one cluster | 100 % | 100 % | |
Psychological | Uncertain of cause of pain and fearful | 88 % | 2 % |
Believes cause from heart | 1 % | 44 % | |
Believes both from heart and musculoskeletal | 0 % | 31 % | |
Believes cause from musculoskeletal and less fearful | 6 % | 14 % | |
Believes cause from other cause and less fearful | 5 % | 8 % | |
Pain | Crushing pain | 74 % | 89 % |
Not crushing pain | 26 % | 11 % | |
Activity limitation | None or light activity limitation | 88 % | 76 % |
Moderate activity limitation | 8 % | 13 % | |
Severe activity limitation | 4 % | 11 % | |
Diagnostic classification | Not heart | 71 % | 1 % |
Typical angina | 13 % | 61 % | |
Maybe angina | 16 % | 38 % | |
Palpation | No palpation findings | 23 % | 23 % |
Local 5/6 signs and intercostal tenderness | 36 % | 1 % | |
Local 2/3/4 signs and pectoral tenderness | 4 % | 32 % | |
Pectoral tenderness | 3 % | 30 % | |
Paraspinal and pectoral tenderness | 23 % | 8 % | |
Generalised tenderness | 11 % | 6 % |