| IAAT | Non-IAAT | P value | ||
---|---|---|---|---|---|
 | N | % | N | % |  |
 | 819 | 76.97 | 245 | 23.03 |  |
Baseline characteristics | |||||
Age (years) | Â | Â | Â | Â | Â |
 Mean ± standard deviation | 60.3 ± 15.1 |  | 61.8 ± 15.1 |  |  |
 Median (25th, 75th percentile) | 62 (51, 71) |  | 63 (52, 72) |  | 0.165 |
Race | Â | Â | Â | Â | Â |
 Caucasian | 543 | 66.30 | 159 | 64.90 | 0.643 |
 African-American | 218 | 26.62 | 71 | 28.98 | |
 Hispanic | 1 | 0.12 | 0 | 0.00 | |
 Other | 9 | 1.10 | 0 | 0.00 | |
 Unknown | 39 | 4.76 | 12 | 4.90 | |
 Asian | 9 | 1.10 | 3 | 1.22 | |
Sex, female | 377 | 46.14 | 119 | 48.57 | 0.504 |
Admission source | Â | Â | Â | Â | Â |
 Home | 585 | 71.52 | 123 | 50.20 | <0.001 |
 Nursing home (including LTAC) | 62 | 7.58 | 30 | 12.24 | |
 Transfer from other hospital | 148 | 18.09 | 83 | 33.88 | |
 Unknown | 20 | 2.44 | 8 | 3.27 | |
 Other | 3 | 36.00 | 1 | 0.41 | |
Comorbidities | Â | Â | Â | Â | Â |
 CHF | 150 | 18.32 | 64 | 26.12 | 0.009 |
 COPD | 190 | 23.30 | 73 | 29.80 | 0.043 |
 CLD | 134 | 16.36 | 36 | 14.69 | 0.619 |
 DM | 202 | 24.66 | 72 | 29.39 | 0.157 |
 CKD | 141 | 17.22 | 53 | 21.63 | 0.131 |
 Malignancy | 379 | 46.28 | 89 | 36.33 | 0.007 |
 HIV | 7 | 85.00 | 5 | 2.04 | 0.161 |
Charlson comorbidity score | Â | Â | Â | Â | Â |
 Mean ± standard deviation | 5.00 ± 3.35 |  | 5.18 ± 3.52 |  |  |
 Median (25th, 75th percentile) | 5 (2, 7) |  | 4 (3, 8) |  | 0.624 |
HCA risk factor | Â | Â | Â | Â | Â |
 Hemodialysis | 55 | 6.80 | 38 | 15.64 | <0.001 |
 Immune suppression | 334 | 41.70 | 90 | 37.34 | 0.228 |
 Prior hospitalization | 485 | 62.26 | 164 | 71.30 | 0.012 |
 Nursing home residence | 62 | 7.57 | 30 | 12.24 | 0.022 |
 Prior antibiotics | 429 | 52.38 | 170 | 69.39 | <0.001 |
 Hospital-acquired BSIa | 366 | 44.69 | 137 | 55.92 | 0.002 |
 Prior bacteremia within 30 days | 95 | 11.60 | 39 | 15.92 | 0.074 |
Sepsis characteristics | |||||
LOS prior to bacteremia (days) | Â | Â | Â | Â | Â |
 Mean ± standard deviation | 7.0 ± 12.1 |  | 11.7 ± 19.6 |  |  |
 Median (25th, 75th percentile) | 1 (0, 10) |  | 5 (0, 16) |  | <0.001 |
Surgery | Â | Â | Â | Â | Â |
 None | 575 | 70.90 | 162 | 66.94 | 0.033 |
 Abdominal | 152 | 18.74 | 36 | 14.88 | |
 Extra-abdominal | 84 | 10.36 | 44 | 18.18 | |
 Central line | 491 | 62.31 | 170 | 72.34 | 0.005 |
TPN at time of bacteremia or prior to it during index hospitalization | 53 | 6.59 | 22 | 9.17 | 0.175 |
APACHE II score | Â | Â | Â | Â | Â |
 Mean ± standard deviation | 16.5 ± 6.2 |  | 18.7 ± 6.6 |  |  |
 Median (25th, 75th percentile) | 16 (12, 20) |  | 18 (14, 22) |  | <0.001 |
Severe sepsis | 451 | 55.07 | 108 | 44.08 | 0.003 |
Septic shock requiring pressors | 368 | 44.93 | 137 | 55.92 | |
On mechanical ventilation | 176 | 21.57 | 89 | 36.33 | <0.001 |
Peak WBC | Â | Â | Â | Â | Â |
 Mean ± standard deviation | 22.1 ± 18.3 |  | 22.9 ± 17.1 |  |  |
 Median (25th, 75th percentile) | 17.0 (7.5, 33.8) |  | 18.3 (8.6, 37.0) |  | 0.298 |
Infection sourceb | Â | Â | Â | Â | Â |
 Urine | 206 | 25.15 | 55 | 22.45 | 0.446 |
 Abdomen | 124 | 15.14 | 31 | 12.65 | 0.355 |
 Lung | 154 | 18.80 | 63 | 25.71 | 0.024 |
 Line | 87 | 10.62 | 22 | 8.98 | 0.548 |
 CNS | 6 | 0.73 | 1 | 0.41 | 1.000 |
 Skin | 41 | 5.01 | 21 | 8.57 | 0.043 |
 Unknown | 260 | 31.75 | 71 | 29.98 | 0.432 |
Polymicrobal BSI | 130 | 15.87 | 59 | 24.08 | 0.003 |
MDR BSI | 16 | 1.95 | 45 | 18.37 | <0.001 |