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Table 2 Multivariate analysis of 1-month survival using a generalized estimating equation

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

 

Odds ratio (95 % confidence interval)

P value

Age per year

0.98 (0.97–0.98)

<0.0001

Male

0.83 (0.69–1.00)

0.52

Witnessed arrest

3.56 (2.83–4.46)

<0.0001

Bystander CPR

1.62 (1.33–1.98)

<0.0001

Call-response interval per minute

0.94 (0.92–0.96)

<0.0001

Initial shockable rhythm

5.33 (4.23–6.71)

<0.0001

Time of 911 call receipt

  

 Night (2301–0700 h)

Reference

 

 Daytime (0701–1500 h)

1.66 (1.34–2.07)

<0.0001

 Evening (1501–2300 h)

1.12 (0.88–1.43)

0.36

  1. Call-response interval, intervals between call receipt and ambulance arrival on-scene; initial rhythm shockable, ventricular fibrillation or pulseless ventricular tachycardia initially monitored by emergency medical service providers. P values were calculated using a generalized estimating equation in addition to the adjustment for the variables listed here. CPR cardiopulmonary resuscitation