Table 2. Patient background variables.
| Characteristics | Case group | Control group | P value |
|---|---|---|---|
| Age, mean (±SD) | 76.7 (±12.0) | 76.1 (±11.7) | 0.391 |
| Sex n (%) (male) | 155 (47.7) | 615 (47.5%) | 0.951 |
| Department | |||
| Orthopaedic surgery n (%) | 199 (61.2) | 649 (50.1) | <0.001 |
| Internal medicine n (%) | 59 (18.2) | 414 (32.0) | <0.001 |
| General surgery n (%) | 21 (6.5) | 123 (9.5) | 0.101 |
| Rehabilitation n (%) | 40 (12.3) | 62 (4.8) | <0.001 |
| Others(Gynecology, Urology, Dermatology, Psychology) n (%) | 6 (1.8) | 47 (3.6) | 0.118 |
| Hospitalized duration mean (SD) (day) | 70.1 (63.5) | 21.0 (27.9) | <0.001 |
| Fall down risk score mean (SD) (point) | 15.7 (4.18) | 11.3 (5.6) | <0.001 |
Continuous variables are analysed by student's t-test.
Percentage variables are analyzed by Fisher's exact probability test.
SD: standard deviation.