Cardiac arrest & resuscitation
Incidence of Out-of-Hospital Cardiac Arrest on a Postholiday Weekday
An erratum to this article was published (JAMA Netw Open, 1 Apr 2026 ↗)
Main finding · Daily OHCA incidenceResult — go to the resultIncidence rate ratio 1.09 95% CI 1.08–1.11Authors' conclusion
In this nationwide cohort study, a postholiday weekday was associated with a significantly elevated out-of-hospital cardiac arrest incidence in South Korea, particularly after consecutive rest days and among vulnerable populations.
Study context
- Population
- Adult OHCA cases occurring on weekdays (excluding holidays), South Korea, 2013–2023
- Participants
- 203,471 OHCA cases
- Exposure
- Postholiday weekday vs baseline weekdays
- Postholiday weekdayn = 49,199
- Baseline weekdaysn = 154,272reference
- Outcome
- OHCA IRR, postholiday weekday vs baseline weekdays
Methodological detailsregistry-based (OHCA Surveillance database), negative binomial regression
- Registry-based (OHCA Surveillance database)
- Negative binomial regression
Main finding
Daily OHCA incidence
Incidence rate ratio
1.09
95% CI 1.08–1.11
P < 0.001
By group
Postholiday weekday vs Baseline weekdays
IRR 1.09 (95% CI 1.08–1.11); P < 0.001
As reported in the abstract
Observational data: associations, not effects.
Further findings
| Outcome | IRR (95% CI) | P value | |
|---|---|---|---|
| Subgroup: age >65 y | 1.03 (1.02–1.04) | P < 0.001 | |
| Subgroup: cardiac cause | 1.02 (1.01–1.04) | P < 0.001 | |
| Subgroup: nonshockable rhythms | 1.03 (1.01–1.04) | P < 0.001 | |
| Duration of preceding holiday (dose-response)After single-day holidays vs Baseline weekdays | 1.03 (0.98–1.08) | P = 0.25 | |
| Duration of preceding holiday (dose-response)After 2-day holidays vs Baseline weekdays | 1.10 (1.08–1.11) | P < 0.001 | |
| Duration of preceding holiday (dose-response)After 3-day holidays vs Baseline weekdays | 1.09 (1.03–1.15) | P = 0.003 | |
| Duration of preceding holiday (dose-response)After holidays ≥4 days vs Baseline weekdays | 1.10 (1.03–1.18) | P = 0.008 | |
| Type of preceding holidayWeekend vs Baseline weekdays | 1.09 (1.07–1.11) | P < 0.001 | |
| Type of preceding holidayMixed vs Baseline weekdays | 1.10 (1.06–1.14) | P < 0.001 | |
| Type of preceding holidayPublic vs Baseline weekdays | 1.03 (0.97–1.09) | P = 0.24 | |
| Type of preceding holidayTemporary vs Baseline weekdays | 1.01 (0.89–1.13) | P = 0.86 | |
| 0.512Incidence rate ratio (log scale) |
Duration of preceding holiday (dose-response)
- A clear dose-response association was observed
Original publication
Incidence of Out-of-Hospital Cardiac Arrest on a Postholiday Weekday. JAMA Netw Open. Published 2 March 2026. doi:10.
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