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Table 1 Baseline characteristics of the study patientsa

From: Arterial hyperoxia and in-hospital mortality after resuscitation from cardiac arrest

Patient characteristics

All patients

(N= 12,108)

Hypoxia/poor

O2 exchange

(n= 8,904)

Normoxia

(n= 1,919)

Hyperoxia

(n= 1,285)

Mean age, yr (±SD)

64 (16)

64 (16)

62 (18)

65 (17)

Male sex, n (%)

7,802 (64)

5,778 (65)

1,228 (64)

796 (62)

Indigenous Australians, n (%)

515 (5)

388 (5)

74 (4)

53 (4)

Hospital admission source from home, n (%)

8,175 (68)

5,986 (67)

1,273 (66)

916 (71)

Acute renal failure, n (%)

2,368 (20)

1,916 (22)

237 (12)

215 (17)

Chronic comorbidities, n (%)

    

   Cardiovascular disease, n (%)

2,395 (20)

1,821 (20)

357 (19)

217 (17)

   Liver disease, n (%)

194 (2)

158 (2)

17 (1)

19 (1)

   Renal disease, n (%)

668 (6)

488 (5)

100 (5)

80 (6)

   Respiratory disease, n (%)

1,044 (9)

831 (9)

102 (5)

111 (9)

   Cirrhosis, n (%)

195 (2)

158 (2)

18 (1)

19 (1)

   Hepatic failure, n (%)

70 (1)

52 (1)

10 (1)

8 (1)

   Immune suppression, n (%)

329 (3)

243 (3)

41 (2)

45 (4)

   Cancer, n (%)

413 (3)

320 (4)

48 (3)

45 (4)

Markers of severity

    

   Median APACHE III risk of death (IQR)

66% (36 to 84)

69% (40 to 86)

50% (20 to 73)

66% (36 to 84)

   Median APACHE III risk of death (no oxygen)b (IQR)

58% (27 to 79)

60% (29 to 80)

47% (18 to 71)

58% (29 to 80)

ICU admission source, n (%)

    

   Emergency department

5,756 (48)

4,123 (46)

1,035 (54)

598 (47)

   Operating theatre

1,261 (10)

925 (10)

217 (11)

119 (9)

   Other hospital

1,958 (16)

1,445 (16)

319 (17)

194 (15)

   Ward

3,113 (26)

2,397 (27)

344 (18)

372 (29)

Treatment limitationc

562 (5)

429 (5)

68 (4)

65 (5)

  1. aAPACHE III, Acute Illness Severity and Chronic Health Evaluation III; IQR, interquartile range; ICU, intensive care unit; bAPACHE III risk of death with oxygen component removed from APACHE III score; ctreatment limitation order or coded for palliative care.