Table 1 Background characteristics of study population medical record research versus all hospitalized patients with main or side diagnosis varicella in 2003-2006
| Â | Â | Study population | All patients 2003-2006 | Â | ||
|---|---|---|---|---|---|---|
| Â | Â | N | % | N | % | p-value |
Age | 0 year | 94 | 31.8% | 492 | 29.7% | Â |
| Â | 1-4 year | 145 | 49.0% | 760 | 45.8% | Â |
|  | ≥5 year | 57 | 19.3% | 406 | 24.5% |  |
Median | Â | 1 | years | 2 | years | p = 0.103 |
Sex | Male | 179 | 60.5% | 931 | 56.2% | p = 0.181 |
| Â | Female | 117 | 39.5% | 727 | 43.8% | Â |
Duration of admission | <1 day | 45 | 15.3% | 239 | 14.4% | Â |
| Â | 1-4 days | 164 | 55.6% | 875 | 52.8% | Â |
|  | ≥5 days | 86 | 29.2% | 543 | 32.8% |  |
Median | Â | 3.6 | days | 3.3 | days | p = 0.658 |
Type of hospital | Academic | 15 | 5.1% | 185 | 11.2% | p = 0.001 |
| Â | Other | 281 | 94.9% | 1473 | 88.8% | Â |
Type of diagnosis | Main | 190 | 64.2% | 1100 | 66.3% | p = 0.465 |
| Â | Side | 106 | 35.8% | 558 | 33.7% | Â |
ICD-9 code* | 052.0 | 2 | 1.1% | 21 | 1.9% | p = 0.436 |
main diagnosis | 052.1 | 11 | 5.8% | 82 | 7.5% | Â |
| Â | 052.7 | 39 | 20.5% | 261 | 23.7% | Â |
| Â | 052.8 | 16 | 8.4% | 66 | 6.0% | Â |
| Â | 052.9 | 122 | 64.2% | 670 | 60.9% | Â |
ICD-9 code* | 052.0 | 0 | 0.0% | 1 | 0.2% | p = 0.489 |
side diagnosis | 052.1 | 0 | 0.0% | 7 | 1.3% | Â |
| Â | 052.7 | 12 | 11.3% | 72 | 12.9% | Â |
| Â | 052.8 | 1 | 0.9% | 17 | 3.0% | Â |
| Â | 052.9 | 93 | 87.7% | 461 | 82.6% | Â |
Total | Â | 296 | 100.0% | 1658 | 100.0% | Â |