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Table 1 Characteristics of clinically-diagnosed skin and soft tissue infection episodes, Kaiser Permanente of Northern California, 20092011 a

From: Incidence, microbiology, and patient characteristics of skin and soft-tissue infections in a U.S. population: a retrospective population-based study

All episodes 471,550 (100)
Type of SSTI  
  Carbuncle and furuncle 24,238 (5)
  Impetigo 37,075 (8)
  Other infections of the skin 31,870 (7)
  Folliculitis 69,000 (15)
  Other SSTI 11,331 (2)
  Cellulitis and abscess 298,036 (63)
Gender  
  Female 249,844 (53)
  Male 221,706 (47)
Age in years  
  Under 5 32,384 (7)
  5- < 18 73,779 (16)
  18- < 50 185,103 (39)
  50- < 65 97,277 (21)
  65+ 83,007 (18)
Mean age (std) 40.82 (24)
Race/ethinicity  
  Asian 55,595 (12)
  African-American 43,407 (9)
  Hispanic 96,626 (20)
  Native American 2,967 (1)
  Multiracial 18,449 (4)
  White 254,507 (54)
Microbiology test performedb 108,243 (23)
Any pathogen identified by microbiology test 58,794 (12)
  1. a Episodes were defined as beginning on the date of the first skin and soft tissue infection (SSTI) diagnosis and ending with the last SSTI or SSTI-related complication diagnosis, not followed by another SSTI or SSTI complication diagnosis within 42 days. Duration of health services use was calculated as the number of days from the start of the episode to the end of the episode. Values in columns are number of episodes and percent of all episodes, unless otherwise indicated.
  2. b Microbiology tests included in analyses were those performed on blood, tissue, body fluid or other miscellaneous bacterial specimens (such as those taken from abscesses, pustules, boils, etc.) obtained from the patient within 7 days prior to the beginning of the SSTI episode to 7 days after the end of the episode. Respiratory, cerebrospinal fluid and urine specimens were excluded. These microbiology tests were considered to have been performed to determine SSTI etiology. A minority of episodes received such testing.