Table 5.
Multivariable regression model* of variables associated with the rate of CDI cases
| Variable | Description | IRR | 95% CI | P-value |
|---|---|---|---|---|
| Year |
2006 |
Referent |
|
|
| |
2007 |
0.43 |
0.22 – 0.83 |
0.013 |
| |
2008 |
0.11 |
0.04 – 0.29 |
< 0.001 |
| |
2009 |
0.14 |
0.06 – 0.32 |
< 0.001 |
| |
2010 |
0.43 |
0.22 – 0.83 |
0.012 |
| Season |
Fall |
Referent |
|
|
| |
Winter |
0.81 |
0.36 – 1.80 |
0.606 |
| |
Spring |
2.07 |
1.10 – 3.89 |
0.023 |
| |
Summer |
1.29 |
0.73 – 2.29 |
0.379 |
| Service |
Medicine1 |
Referent |
|
|
| |
Surgery |
1.15 |
0.20 – 6.53 |
0.871 |
| Other2 | 0.74 | 0.18 – 2.95 | 0.667 |
*Multivariable multilevel negative binomial regression model with a random intercept for ward.
CDI = Clostridium difficile infection.
IRR = Incidence rate ratio.
CI = Confidence interval.
1Included the following departments: intensive care (adult and neonatal), oncology, pediatrics, and internal medicine.
2Included the following departments: psychiatry, rehabilitation, hospice, childbirth, and nursery.