Table 3.
Ordered logistic regression analysis of the association between cluster membership and demographic variables
| Demographic variables | Univariable analysis | Multivariable analysis |
|---|---|---|
| Odds ratio (95% CI) | Odds ratio (95% CI) | |
| Age, per 5 years | 1.06 (0.88—1.28) | 1.17 (0.84—1.63) |
| Charlson Comorbidity Index, point | 0.97 (0.76—1.23) | 1.06 (0.70—1.61) |
| Initial shockable rhythm, yes | 0.02 (0.004—0.14) | 0.07 (0.01—0.46) |
| Time to ROSC, per 5 min | 1.04 (1.01—1.09) | 1.12 (0.88—1.42) |
| Base deficit at admission, per mmol/L | 1.23 (1.10—1.37) | 1.18 (1.03—1.35) |
| Circulatory shocka in the ER, yes | 5.64 (1.71—18.62) | 1.93 (0.47—7.85) |
In ordered logistic regression, the odds ratios among clusters are equal, and the odds ratio should be interpreted as the odds of a higher cluster than the compared cluster when the explanatory variable is increased by one unit and all other variables are held constant. Pseudo R2 = 0.30
CI Confidence interval, ER Emergency room, ROSC Return of spontaneous circulation
aSystolic blood pressure < 90 mmHg or in need of fluids and/or vasopressors to maintain systolic blood pressure > 90 mmHg