Table 4.

Multivariable linear regression of total surgeries for infection and total time in hospital related to infection for all baseline characteristics in Table 1 and all comorbidities in Table 2 that first achieved p-value less than 0.05 in univariate analysis. Adjusted p-values compare total surgeries for infection treatment between groups with and without comorbidity. Raw proportions of patients with each comorbidity shown is shown on the left. Multivariable regression estimates with 95% CI’s demonstrate increased surgery for infection associated with each comorbidity or characteristic.

Comorbidity or characteristic	Average (lower 95% CI, upper 95% CI) or proportion	Adjusted additional surgeries (lower 95% CI, upper 95% CI)	Adjuste d p-value
Chronic pulmonary disease	37 / 149 (24.8%)	1.36 (0.51, 2.22)	0.0020
Anemia	99 / 149 (66.4%)	1.17 (0.42, 1.92)	0.0024
Age	60.6 (58.3, 62.9)	−0.02 / year (−0.05, 0.00)	0.0801
Tobacco abuse	33 / 149 (22.1%)	0.75 (−0.13, 1.64)	0.0958
Sleep apnea	20 / 149 (13.4%)	0.94 (−0.17, 2.05)	0.0973
Uncomplicated diabetes mellitus	39 / 149 (26.2%)	0.49 (−0.36, 1.34)	0.2601
Obesity	68 / 149 (45.6%)	−0.01 (−0.77, 0.76)	0.9814
Comorbidity or characteristic	Patients with comorbidity or average	Adjusted additional days in hospital (lower 95% CI, upper 95 %CI)	Adjusted p-value
Chronic pulmonary disease	37 / 149 (24.8%)	9.41 (2.75, 16.07)	0.0059
Psychiatric disease	31 / 149 (20.8%)	9.52 (2.58, 16.46)	0.0075
Anemia	99 / 149 (66.4%)	7.53 (1.68, 13.39)	0.0120
Sleep apnea	20 / 149 (13.4%)	10.40 (1.70, 19.09)	0.0195
Uncomplicated diabetes mellitus	39 / 149 (26.2%)	7.94 (1.29, 14.60)	0.0197
Age	60.6 (58.3, 62.9)	−0.17 / year (−0.37, 0.03)	0.0999
Tobacco abuse	33 / 149 (22.1%)	4.24 (−2.58, 11.07)	0.2213
Renal disease	23 / 149 (15.4%)	4.89 (−3.17, 12.96)	0.2325
Obesity	68 / 149 (45.6%)	−0.16 (−6.02, 5.71)	0.9583