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Table 2 Risk factors associated with LOS among inpatient and LTC post-CRAB culture: Unadjusted and multivariable regression

From: Epidemiology and outcomes associated with carbapenem-resistant Acinetobacter baumannii and carbapenem-resistant Pseudomonas aeruginosa: a retrospective cohort study

Characteristics Inpatient
[N = 558]
Long-Term Care (LTC)
[N = 227]
Unadjusted
IRR (95% CI)
Adjusted IRR (95% CI) Unadjusted
IRR (95% CI)
Adjusted IRR (95% CI)
Demographic & clinical characteristics     
 Male 0.58 (0.28–1.21) 0.73 (0.32–1.65)
 Age category     
  18–49 Reference Reference Reference Reference
  50–64 0.68 (0.39–1.19) 0.64 (0.37–1.10) 1.11 (0.68–1.80) 1.04 (0.63–1.71)
  65 +  0.49 (0.29–0.84) 0.50 (0.29–0.84) 0.98 (0.61–1.58) 0.91 (0.56–1.49)
 Race     
  White Reference Reference
  African American 1.07 (0.86–1.33) 1.02 (0.78–1.34)
  Other* 0.68 (0.30–1.54) 0.67 (0.27–1.65)
 Ethnicity     
  Non-Latine Reference Reference
  Latine 1.01 (0.75–1.37) 1.05 (0.57–1.94)
 Region     
  South Reference Reference Reference
  Midwest 1.27 (0.94–1.71) 1.41 (1.05–1.88) 0.81 (0.56–1.16)
  West 1.14 (0.86–1.52) 1.35 (1.02–1.79) 1.23 (0.83–1.83)
  Northeast 0.79 (0.55–1.13) 0.98 (0.69–1.39) 1.13 (0.64–2.01)
  U.S. Territory 1.16 (0.82–1.64) 1.49 (1.04–2.13) 1.18 (0.52–2.68)
 Rurality     
  Urban Reference Reference
  Rural 0.74 (0.47–1.15) 1.01 (0.32–3.19)
 Facility complexity     
  High Reference Reference
  Low 0.51 (0.22–1.16) 1.53 (0.63–3.74)
 Specimen type     
  Urine Reference Reference Reference Reference
  Respiratory 0.95 (0.71–1.26) 0.82 (0.62–1.10) 1.31 (0.90–1.91) 1.23 (0.84–1.79)
  Blood 0.42 (0.27–0.67) 0.47 (0.30–0.73) 1.11 (0.48–2.58) 1.15 (0.51–2.61)
  Other 1.04 (0.79–1.37) 1.04 (0.80–1.36) 1.24 (0.92–1.68) 1.34 (1.00–1.81)
Co-morbidities     
 Charlson Score 0.96 (0.93–0.99) 0.95 (0.92–0.98) 1.01 (0.96–1.05) 0.99 (0.94–1.04)
 SCI/D     
  No Reference Reference
  Yes 1.55 (1.14–2.09) 0.88 (0.65–1.19)
Antibiotic exposure in previous 90 days     
 Any Antibiotics     
  No Reference Reference Reference
  Yes 0.98 (0.79–1.22) 0.67 (0.49–0.93) 0.72 (0.52–0.99)
 Fluoroquinolones     
  No Reference Reference
  Yes 0.93 (0.70–1.23) 0.46 (0.30–0.69)
 3rd and 4th generation cephalosporins     
  No Reference Reference
  Yes 1.48 (0.77–2.85) 0.62 (0.20–1.97)
 Carbapenems     
  No Reference Reference
  Yes 1.37 (0.41–4.65)
Length of stay 1 year prior to culture 1.00 (1.00–1.00) 1.00 (1.00–1.01) 1.00 (1.00–1.00) 1.00 (1.00–1.00)
  1. Significant associations are shown in bold (p < 0.05)
  2. *Other includes, Asian, Native American and Pacific Islander
  3. Other specimen types include wounds, skin/soft tissue, body fluid, bone/joint, rectal cultures
  4. Respiratory specimen types include bronchial alveolar, tracheal aspirate, induced sputum, etc.