Table 2 Secondary analysis cohort (AmsterdamUMCdb) characteristics
| Â | Total (N (%)) | Oxygen device in use at eligibility (N (%)) | |
|---|---|---|---|
All | Noninvasive ventilation | Non-rebreather mask | |
Total | 1,279 | 296 | 983 |
Age-group | |||
 18–39 | 131 (10) | 19 (6) | 112 (11) |
 40–49 | 103 (8) | 15 (5) | 88 (9) |
 50–59 | 213 (17) | 46 (16) | 167 (17) |
 60–69 | 312 (24) | 84 (28) | 228 (23) |
 70–79 | 342 (27) | 89 (30) | 253 (26) |
 80 +  | 178 (14) | 43 (15) | 135 (14) |
Sex | |||
 Female | 493 (39) | 123 (42) | 370 (38) |
 Male | 786 (61) | 173 (58) | 613 (62) |
Year of ICU admission | |||
 2003–2009 | 801 (63) | 204 (69) | 597 (61) |
 2010–2016 | 478 (37) | 92 (31) | 386 (39) |
Type of care unit | |||
 Intensive care (Level 3) | 908 (71) | 236 (80) | 672 (68) |
 Medium care (Level 2) | 145 (11) | 42 (14) | 103 (11) |
 Both | 210 (16) | 17 (6) | 193 (20) |
Baseline clinical data (median [IQR]) | |||
 Peripheral oxygen saturation | 96 [93, 98] | 95 [92, 98] | 96 [93, 98] |
 Fraction of inspired oxygen | 0.60 [0.51, 0.66] | 0.60 [0.42, 0.77] | 0.66 [0.51, 0.66] |
 Respiratory rate | 28 [22, 34] | 31 [25, 38] | 25 [20, 32] |
Oxygen device used at any point | |||
 Noninvasive ventilation | 472 (37) | 296 (100) | 176 (18) |
 Non-rebreather mask | 1,119 (88) | 139 (47) | 983 (100) |