eTable 1. Baseline characteristics of intensive care units participating in the surveillance project since 2001*.
| Variable |
2001–2015 Total cohort (N = 77 ICUs) |
2001–2015 Core cohort (N =20 ICUs) |
| Hospitals, No | 44 | 10 |
| Participating ICUs, No | 77 | 20 |
| No of ICU beds, median (IQR) | 12 (10– 16) | 12 (10– 15) |
| Type of ICU | ||
| Interdisciplinary, n (%) | 35 (45) | 6 (30) |
| Medical, n (%) | 19 (25) | 7 (35) |
| Surgical, n (%) | 23 (30) | 7 (35) |
| Data collection of ICUs in months, median (IQR) | 89 (60–156) | 180 (164–180) |
| No of hospital beds, median (IQR) | 572 (411–1008) | 956 (308–1484) |
| Medical care level of hospital | ||
| Maximum care: university medical center, n (%) | 8 (18) | 3 (30) |
| Maximum care: other, n (%) | 8 (18) | 3 (30) |
| Secondary care with specialty focus, n (%) | 12 (27) | 1 (10) |
| Secondary care hospital, n (%) | 1 (2) | – |
| Standard care, n (%) | 13 (30) | 2 (20) |
| Basic care, n (%) | 2 (5) | 1 (10) |
| Patient days in total | 2 920 068 | 1 229 428 |
* The total cohort includes all ICUs that ever submitted data to SARI (N = 77). The core cohort includes those ICUs, that continuously submitted data from 2001 through 2015 (N = 20, core cohort). The data of the total cohort were included in the main analysis in the manuscript. The data of the core cohort were used for the sensitivity analysis and compared with those of the total cohort.
ICU: intensive care unit; IQR: interquartile range; SARI: Surveillance der Antibiotika-Anwendung und der bakteriellen Resistenzen auf deutschen Intensivstationen [surveillance of antibiotic use and resistance in intensive care units]