Fig. 2

Psychological stress and somatic symptom condition score and combined Brief Job Stress Questionnaire (BJSQ) score between baseline and 5 months post-entry. Psychological stress condition score (a), somatic symptom condition score (b) and combined BJSQ score (c), and individual combined BJSQ scores (d) are shown for job entry (April, baseline) and 5 months post-entry (September). The data (a–c) are shown as maximum, 75%, median, 25%, and minimum as a boxplot. **p < 0.01 values was regarded as statistically significant in the Wilcoxon signed-rank test