Table 1. Characteristics of CDI cases and controls without community associated CDI by time period of follow-up before and after CDI diagnosis.
| Time | 1 year—6 months prior | 6 months—1 day prior | CDI—6 months post | 6 months—1 year post | ||||
|---|---|---|---|---|---|---|---|---|
| Case | Control | Case | Control | Case | Control | Case | Control | |
| N | 1,887 | 7,307 | 1,887 | 7,307 | 1,637 | 6,321 | 1,503 | 5,740 |
| Male (%) | 37.5 | 37.7 | 37.5 | 37.7 | 37.5 | 37.4 | 37.8 | 37.6 |
| Dialysis (%) | 1.8 | 0.1 | 2.0 | 0.1 | 1.4 | 0.1 | 1.3 | 0.1 |
| Diabetes diagnosis (%) | 15.0 | 12.4 | 15.6 | 13.0 | 14.4 | 12.7 | 14.5 | 13.0 |
| Charlson Co-morbidity Index score (without Diabetes or Renal failure) (%) | ||||||||
| 0 | 68.3 | 81.9 | 66.7 | 80.9 | 68.3 | 81.2 | 65.8 | 81.2 |
| 1 | 17.6 | 11.2 | 17.4 | 11.9 | 16.8 | 11.8 | 16.8 | 11.5 |
| 2 | 9.2 | 5.1 | 10.3 | 5.3 | 9.7 | 5.3 | 10.5 | 5.4 |
| 3+ | 4.9 | 1.8 | 5.6 | 2.0 | 5.2 | 1.7 | 6.9 | 1.9 |
| Age (years) | ||||||||
| Median | 56 | 55 | 56 | 55 | 55 | 54 | 56 | 55 |
| Lower Quartile | 41 | 40 | 41 | 41 | 40 | 40 | 41 | 41 |
| Upper Quartile | 70 | 69 | 71 | 69 | 68 | 67 | 69 | 67 |
| Ambulatory Care Contacts in the year prior to the evaluated time period (n) | ||||||||
| Median | 10 | 6 | 10 | 6 | 12 | 6 | 15 | 6 |
| Lower Quartile | 5 | 3 | 5 | 3 | 6 | 2 | 9 | 3 |
| Upper Quartile | 19 | 12 | 19 | 12 | 20 | 12 | 24 | 12 |
| SEFI Socio-economic Measure | ||||||||
| Median | -0.18 | -0.18 | -0.18 | -0.18 | -0.21 | -0.19 | -0.21 | -0.19 |
| Lower Quartile | -0.70 | -0.69 | -0.70 | -0.69 | -0.72 | -0.70 | -0.72 | -0.71 |
| Upper Quartile | 0.27 | 0.28 | 0.27 | 0.28 | 0.26 | 0.27 | 0.26 | 0.27 |
| Recurrence (% of all CDI cases) | ||||||||
| Yes | 12.7 | 12.7 | 12.2 | 11.9 | ||||
| No, but later infection (i.e. 2 or more episodes) | 5.9 | 5.9 | 5.8 | 5.7 | ||||
| No (incident only/ single episode) |
81.4 | 81.4 | 82.0 | 82.4 | ||||