Table 2.
Summary Statistics for HES Data (April 2010–March 2020) Matched with ONS Mortality Data (April 2010—March 2021), Used for Survival Analysis
| CABG | Missing Data CABG | THR | Missing Data THR | |
|---|---|---|---|---|
| Sample size | 82,029 | 633,941 | ||
| Sex | ||||
| Female | 17% | 0 % | 60% | 0% |
| Male | 83% | 40% | ||
| IMD quintile | ||||
| Q1 (most deprived) | 17% | 2% | 12% | 1% |
| Q2 | 19% | 17% | ||
| Q3 | 21% | 22% | ||
| Q4 | 21% | 24% | ||
| Q5 (least deprived) | 20% | 24% | ||
| Ethnicity category | ||||
| White | 76% | 13% | 86% | 13% |
| Mixed | 0% | 0% | ||
| Asian or Asian British | 8% | 1% | ||
| Black or Black British | 1% | 1% | ||
| Other ethnicity | 2% | 0% | ||
| Death observed during follow-up | ||||
| No | 84% | 0% | 86% | 0% |
| Yes | 16% | 14% | ||
| Waiting time from referral to treatment in days | Mean: 61 Min: 1 Max: 2866 SD: 59 Median: 48 |
11% | Mean: 91 Min: 1 Max: 6,375 SD: 80 Median: 78 |
8% |
CABG, coronary artery bypass graft; HES, Hospital Episode Statistics; IMD, Index of Multiple Deprivation; ONS, Office of National Statistics; SD, standard deviation; THR, total hip replacement.