Table 1 Study variables; prevalence separately for pain/ no pain

Girls

218 (51.7 %)

125 (57.9 %)

92 (44.6 %)

Boys

204 (48.3 %)

91 (42.1 %)

113 (54.9 %)

7.11*

Pain

216 (51.2 %)

 Long-term pain (3 months and more)

153 (36.3 %)

Stress

 Higher stress (PSQ ≥ 0.45)

93 (22.0 %)

74 (34.3 %)

19 (9.2 %)

38.47**

 Lower stress (PSQ < 0.45)

329 (78 %)

142 (65.7 %)

187 (90.8 %)

 Total (mod.PSQ; 0–10), mean (SD)

3.3 (1.6)

3.9 (1.7)

2.7 (1.3)

 Worries (0–10), mean (SD)

2.7 (1.9)

3.3 (2.1)

2.1 (1.5)

 Tension (0–10), mean (SD)

3.5 (1.8)

4.2 (1.9)

2.8 (1.3)

 Joy (0–10), mean (SD)

3.6 (1.9)

4.0 (2.0)

3.1 (1.7)

 Demands (0–10), mean (SD)

4.2 (2.1)

4.9 (2.2)

3.5 (1.8)

BMI

20.8 (3.1)

21.0 (3.1)

20.5 (3.2)