Characteristics of the study population
| Variable | Isolated patient (N=200) | Non-isolated patient (N=200) | Total (N=400) | P value |
| Sex | ||||
| Woman | 104 (52%) | 105 (52.5%) | 209 (52.2%) | 0.92* |
| Man | 96 (48%) | 95 (47.5%) | 191 (47.8%) | |
| Age | ||||
| Mean (SD) | 72.3 (15.2) | 72.4 (14) | 72.3 (14.6) | 0.80† |
| Median (IQR) | 75.5 (19.7) | 75 (18) | 75 (18) | |
| Intrinsic risk factors | ||||
| Absence | 8 (4%) | 13 (6.5%) | 21 (5.2%) | 0.26* |
| Presence | 192 (96%) | 187 (93.5%) | 379 (94.8%) | |
| No Intrinsic risk factors | ||||
| 0 | 8 (4%) | 13 (6.5%) | 21 (5.2%) | 0.02* |
| 1 | 17 (8.5%) | 25 (12.5%) | 42 (10.5%) | |
| 2 | 24 (12%) | 33 (16.5%) | 57 (14.2%) | |
| 3 or more | 151 (75.5%) | 129 (64.5%) | 280 (70%) | |
| Extrinsic risk factors | ||||
| Absence | 5 (2.5%) | 9 (4.5%) | 14 (3.5%) | 0.28* |
| Presence | 195 (97.5%) | 191 (95.5%) | 386 (96.5%) | |
| Length of hospital stay (days) | ||||
| Median (IQR) | 9 (13) | 9 (10) | 9 (11) | 0.37† |
*2 test.
†Mann-Whitney U test.
IQR, interquartile range; SD, standart deviation.