title: Wide geographic variation between Pennsylvania counties in the population rates of hospital admissions for pneumonia among children with and without comorbid chronic conditions.
abstract: OBJECTIVE
  To compare county rates of hospital admissions for pediatric pneumonia and to assess the contribution of comorbid chronic conditions to county and state pediatric pneumonia admission rates.
  
  
  METHODS
  We performed retrospective analyses of data for all Pennsylvania-resident children 2 months through 17 years of age who were admitted to acute care hospitals with a principal diagnosis of pneumonia in 2003 or 2004. We divided the admissions into 2 groups (all pneumonia and pneumonia excluding coded comorbid chronic conditions) and calculated admission rates for each Pennsylvania county.
  
  
  RESULTS
  There were 5429 pediatric pneumonia admissions during the 12-month study period, of which 4948 (91.1%) were included in the study. The Pennsylvania state admission rate for all pneumonia was 156.3 admissions per 100000 children. County admission rates for all pneumonia ranged from 77.0 admissions per 100000 children to 457.6 admissions per 100000 children. Similar geographic patterns were seen among the 2851 admissions that remained in the second group after the exclusion of 2097 records (42.4%) coded for comorbid chronic conditions. The Pennsylvania state admission rate for pneumonia without chronic conditions was 90.0 admissions per 100000 children. County admission rates for pneumonia without comorbid chronic conditions ranged from 18.3 admissions per 100000 children to 350.3 admissions per 100000 children. Sixty-two (93%) of 67 counties remained in the same or an adjacent admission rate quintile after children with comorbid chronic conditions were excluded. On average, the county admission rates for pneumonia without comorbid chronic conditions were 58.1% of their admission rates for all pneumonia.
  
  
  CONCLUSIONS
  County pediatric pneumonia admission rates vary widely, even among geographically contiguous and demographically similar counties. Excluding children with comorbid chronic conditions, to control for varying community disease burdens, did not alter substantially the county rank order or the pattern or degree of variations in admission rates in our study.
authors.affiliation: Pennsylvania Health Care Cost Containment Council, Harrisburg, Pennsylvania, USA. kitgorton@comcast.net
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Gorton
authors.forename: Jayne L
authors.initials: JL
authors.lastname: Jones
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007223:Infant; D010414:Pennsylvania / Q000453:epidemiology; D011014:Pneumonia / Q000150:complications / Q000453:epidemiology / Q000628:therapy*; D017062:Small-Area Analysis