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Table 1 Summary statistics and the results of the tests for comparing groups for demographic variables

From: Real-time compression feedback for patients with in-hospital cardiac arrest: a multi-center randomized controlled clinical trial

Variable

Total (n = 900)

Intervention (n = 450)

Control (n = 450)

Significance

Mean ± SD

N (%)

Mean ± SD

N (%)

Mean ± SD

N (%)

P value

Age

57.42 (5.81)

 

57.26 (5.44)

 

57.57 (6.16)

 

0.72a

ICU length of stay (days)

25.82 (10.88)

 

26.95 (10.82)

 

24.69 (10.84)

 

< 0.001a

Nurse ICU experience (years)

21.47 (4.70)

 

21.48 (5.13)

 

21.46 (4.24)

 

0.27a

Sex, female

 

546 (60.7%)

 

274 (60.9%)

 

272 (60.4%)

0.89b

Intubated prior to CPR event, Yes

 

368 (40.9%)

 

176 (39.1%)

 

192 (42.7%)

0.28 b

Intubated during CPR event, Yes

   

34 (7.6%)

 

36 (8%)

0.83 b

Multi-organ dysfunction, Yes

 

438 (48.7%)

 

210 (46.7%)

 

228 (50.7%)

0.23 b

  1. aMann–Whitney U test
  2. bChi-square test