Fig. 1: War exposure score plotted against logged hair cortisol concentration stratified by age at time of leaving Syria.

Year 1 and year 2 samples are plotted for each individual where available (purple = Year 1, orange = Year 2). Lines represent the predicted population-level hair cortisol concentration for the number of war-related events on from linear mixed models controlling for sex, analysis batch and age at interview. Grey regions represent confidence intervals for the predicted values. The association between war exposure and cortisol is plotted separately for different age groups at the time of leaving Syria with A = younger than 6 years, B = 6-7 years, C = 8-9 years, D = 10-11 years, and E = older than 12 years.