One year annual comorbidity prevalence with 95% confidence intervals, 1993–1998
| Year | Comorbid cases within year | Patient years exposure (PYE) | Rates per 100000 PYE | Lower 95% confidence interval | Upper 95% confidence interval |
|---|---|---|---|---|---|
| 1993 | 492 | 988735 | 49.76 | 48.38 | 51.17 |
| 1994 | 612 | 1002276 | 61.06 | 59.54 | 62.61 |
| 1995 | 665 | 1028414 | 64.66 | 64.16 | 65.16 |
| 1996 | 702 | 1045543 | 67.14 | 66.98 | 67.30 |
| 1997 | 780 | 1056767 | 73.81 | 73.28 | 74.34 |
| 1998 | 872 | 1080348 | 80.71 | 80.16 | 81.27 |