Skip to main content

Table 4 Risk prediction model for prolonged (> 9 days) length of ICU stay following C. difficile infections (CDI) among adult inpatients with CDI who survived the first 30 days following CDI (N = 307)a

From: Risk prediction for 30-day mortality among patients with Clostridium difficile infections: a retrospective cohort study

VariablesCrude OR (95% CI)P-valueLogistic regression model - Original (N = 99)P-valueLogistic regression model - Imputed (N = 307)P-value
Adjusted OR (95% CI)Adjusted OR (95% CI)
Age > 65 years old1.51 (0.88, 2.57)0.1331.37 (0.56, 3.36)0.4921.28 (0.72, 2.30)0.400
Malignancy0.57 (0.32, 1.03)0.0610.60 (0.23, 1.60)0.3100.54 (0.29, 1.03)0.061
WBC in tertiles, cells/mm3
 1st tertile: <  94401.00 (Ref) 1.00 (Ref) 1.00 (Ref) 
 2nd tertile: 9440 to < 14,6001.33 (0.68, 2.61)0.4121.17 (0.37, 3.74)0.7861.19 (0.57, 2.52)0.640
 3rd tertile: ≥ 14,6002.33 (1.21, 4.50)0.0121.21 (0.36, 4.01)0.7561.76 (0.84, 3.69)0.132
Rise in SCr ≥ 1.5-fold1.48 (0.79, 2.76)0.2172.40 (0.92, 6.26)0.0731.34 (0.69, 2.59)0.393
Albumin < 2.5 g/dL2.22 (1.08, 4.54)0.0301.89 (0.72, 4.95)0.1951.36 (0.66, 2.82)0.400
BUN-to-SCr ratio > 204.74 (2.66, 8.46)< 0.0013.81 (1.51, 9.58)0.0054.01 (2.19, 7.33)< 0.001
Glucose tertiles, mg/dL
 1st tertile: < 1421.00 (Ref) 1.00 (Ref) 1.00 (Ref) 
 2nd tertile: 142 to < 1931.61 (0.83, 3.12)0.1611.41 (0.46, 4.33)0.5451.28 (0.72, 2.30)0.480
 3rd tertile: ≥ 1931.57 (0.79, 3.11)0.1940.87 (0.28, 2.72)0.8120.54 (0.29, 1.03)0.618
C statistic (95% CI)  0.741 (0.639, 0.844) 0.737 (0.671, 0.804) 
  1. Abbreviations: BUN blood urea nitrogen, CI confidence interval, OR odds ratio, Ref reference, SCr serum creatinine, WBC white blood cell count
  2. aWe included variables in a logistic regression model and evaluated the discrimination performance using conventional c statistic.