Table 1. Characteristics of Case vs. Control Subjects with Healthcare-associated Infections Caused by Gram-Negative Bacilli.
| Characteristic | Case Subjects (n=103) | Control Subjects (n=195) | p-valuea |
|---|---|---|---|
| n (%) | |||
| Age group | 0.701 | ||
| < 50 yrs | 22 (21.4) | 44 (22.6) | |
| 50–75 yrs | 57 (55.3) | 94 (48.2) | |
| > 75 yrs | 24 (23.3) | 57 (29.2) | |
| Sex | 1.00 | ||
| Male | 59 (57.3) | 111 (56.9) | |
| Female | 44 (42.7) | 84 (43.1) | |
| Race | 0.43 | ||
| White | 34 (33.0) | 47 (24.1) | |
| Black | 8 (7.8) | 21 (10.8) | |
| Asian/Pacific Islander | 2 (1.9) | 4 (2.1) | |
| Other | 15 (14.6) | 30 (15.4) | |
| Unknown | 44 (42.7) | 93 (47.7) | |
| Ethnicity | 0.63 | ||
| Hispanic | 12 (11.7) | 18 (9.2) | |
| Non-Hispanic | 30 (29.1) | 51 (26.2) | |
| Unknown | 61 (59.2) | 126 (64.6) | |
| Campusb | 1.00 | ||
| Columbia University Medical Center | 49 (47.6) | 96 (49.2) | |
| Weill Cornell Medical Center | 54 (52.4) | 99 (50.8) | |
| ICU typeb | 0.82 | ||
| Medical ICU | 53 (51.5) | 103 (52.8) | |
| Surgical and Burn ICU | 50 (48.5) | 92 (47.2) | |
| Type of infectionb | 1.00 | ||
| Bloodstream | 34 (33.0) | 68 (34.9) | |
| Pneumonia | 50 (47.6) | 92 (47.2) | |
| Urinary tract | 19 (19.4) | 35 (17.9) | |
| Pathogenb | <0.001 | ||
| Klebsiella pneumoniae | 48 (46.6) | 100 (51.3) | |
| Acinetobacter spp. | 49 (47.6) | 21 (10.8) | |
| Pseudomonas aeruginosa | 6 (5.8) | 74 (37.9) | |
a
Bivariate conditional logistic regression
b
Variable included in matching hierarchy
ICU= Intensive care unit