|
Analysis method
|
Odds ratio
|
95% CI
|
P value
|
|---|
|
Unadjusted
|
8.37
|
3.64–19.27
|
< .001
|
|
Adjusted using logistic regression
|
9.52
|
5.31–17.08
|
< .001
|
|
IPTW using PS
|
9.14
|
3.36–24.85
|
< .001
|
- The IPTW method creates a synthetic sample in which the distribution of measured baseline covariates is independent of exposure assignment. The weight of each participant is calculated using two variables: the participant’s exposure status (0 for absence of gasping and 1 for presence of gasping) and the PS of the participant. The weight of the participant is equal to the inverse of the probability of receiving the treatment that the participant actually received
- EMS Emergency Medical Services, PS propensity score, IPTW Inverse probability of treatment weighting, CI confidence interval
