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Table 1 Baseline characteristics and clinical outcome by time of day of cardiac arrest occurrence

From: Nighttime is associated with decreased survival and resuscitation efforts for out-of-hospital cardiac arrests: a prospective observational study

 

Time of 911 emergency call receipt

P value

Daytime

Evening

Night

0701–1500 h

1501–2300 h

2301–0700 h

(n = 5474)

(n = 5336)

(n = 2970)

Age, years

75 (63–83)

76 (64–84)

74 (61–83)

0.0003

Sex, % male

61.9

59.1

60.3

0.12

Location, % home

66.0

75.6

76.2

<0.0001

Witnessed arrest, %

51.6

47.4

46.4

<0.0001

Bystander CPR, %

37.3

37.8

33.6

0.0003

Call-response interval, minutes

7.0 (6.0–10)

7.0 (6.0–10)

7.0 (6.0–9.0)

<0.0001

Initial shockable rhythm, %

9.1

7.0

7.2

0.0001

Cardiac etiology, %

51.8

51.1

56.0

<0.0001

Prehospital ROSC, %

10.4

7.4

5.5

<0.0001

ROSC, %

38.2

32.3

29.6

<0.0001

24-h survival, %

15.3

10.8

9.9

<0.0001

1-month survival, %

7.6

5.0

4.9

<0.0001

1-month good recovery, %

4.7

2.9

3.1

<0.0001

  1. Data are presented as the median (interquartile range) for continuous variables and absolute numbers (percentages) for categorical data. Call-response interval, the interval between call receipt and ambulance arrival on scene; initial shockable rhythm, ventricular fibrillation or pulseless ventricular tachycardia initially monitored by emergency medical services providers; 1-month good recovery, survival with favorable neurological outcome defined as cerebral performance category of 1 or 2 at 1 month after cardiac arrest. P values were calculated using the Kruskal-Wallis test and chi-squared test. CPR cardiopulmonary resuscitation, ROSC return of spontaneous circulation