Survival and characteristics in in-of-hospital cardiac arrest during 2004–20. (A–H) shows trends in characteristics, management and survival in in-hospital cardiac arrest in Sweden during 2004–20. All results are adjusted, using logistic regression, for age and sex, except from critical time intervals (provided as crude numbers). Smooth lines depict a polynomial regression line to visualize the trend. Note some y axes in some panels are truncated. Odds ratios and P-values for calendar year modelled as a linear predictor are provided in Supplementary material online, Table S3. OR = odds ratio.