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Table 1 Background characteristics of study population medical record research versus all hospitalized patients with main or side diagnosis varicella in 2003-2006

From: Hospitalization due to varicella in the Netherlands

   Study population All patients 2003-2006  
   N % N % p-value
Age 0 year 94 31.8% 492 29.7%  
  1-4 year 145 49.0% 760 45.8%  
  ≥5 year 57 19.3% 406 24.5%  
Median   1 years 2 years p = 0.103
Sex Male 179 60.5% 931 56.2% p = 0.181
  Female 117 39.5% 727 43.8%  
Duration of admission <1 day 45 15.3% 239 14.4%  
  1-4 days 164 55.6% 875 52.8%  
  ≥5 days 86 29.2% 543 32.8%  
Median   3.6 days 3.3 days p = 0.658
Type of hospital Academic 15 5.1% 185 11.2% p = 0.001
  Other 281 94.9% 1473 88.8%  
Type of diagnosis Main 190 64.2% 1100 66.3% p = 0.465
  Side 106 35.8% 558 33.7%  
ICD-9 code* 052.0 2 1.1% 21 1.9% p = 0.436
main diagnosis 052.1 11 5.8% 82 7.5%  
  052.7 39 20.5% 261 23.7%  
  052.8 16 8.4% 66 6.0%  
  052.9 122 64.2% 670 60.9%  
ICD-9 code* 052.0 0 0.0% 1 0.2% p = 0.489
side diagnosis 052.1 0 0.0% 7 1.3%  
  052.7 12 11.3% 72 12.9%  
  052.8 1 0.9% 17 3.0%  
  052.9 93 87.7% 461 82.6%  
Total   296 100.0% 1658 100.0%  
  1. * ICD-9 code: 052.0 = postvaricella encephalitis, 052.1 = varicella (hemorrhagic) pneumonitis, 052.7 = varicella with other specified complications, 052.8 = varicella with unspecified complication, 052.9 = varicella without complication