Table 2.

Odds ratios and confidence intervals of lower limb pain by age, sex, psychosomatic symptoms, physical fitness, frequency of exercise and hypermobility using univariate and multivariate logistic regression analyses. All figures were adjusted for occurrence of other musculoskeletal pain symptoms.

Variables	Univariate analysis (OR [95% CI])	Multivariate analysis© (OR [95% CI])
Sex
Boys	Reference
Girls	0.83 (0.65–1.07)
Age (years)
9–10	Reference	Reference
11–13	0.74 (0.57–0.95)	0.66 (0.38 – 0.82)
°Psychosomatic symptoms
Headache	1.93 (1.48–2.54)	1.61 (1.09–2.22)
Abdominal pain	2.34 (1.72–3.05)	1.57(1.03–2.12)
Depressive feelings	2.29 (1.72–3.05)	1.63 (1.09–2.32)
Difficulty falling asleep	1.73 (1.31–2.27)
Day tiredness	2.79 (1.37–2.49)	2.54 (1.74–3.01)
Waking up during nights	1.84 (1.37–2.49)
* Regional knee hypermobility	0.86 (0.64–1.16)
Frequency of exercise
0–2	Reference
3–4	1.27 (0.95–1.70)	1.25(0.77–1.64)
5–7	1.87 (1.31–2.67)	1.85(1.20–2.87)
Beighton score for hypermobility
< 6	Reference
6–9	2.10 (0.86–5.05)
aVo2 max
Average	Reference
Low	0.79 (0.56–1.12)
High	1.29 (0.93–1.77)

^° Reported in a frequency of at least once a week.

^© Using backward stepwise procedure. Only entered variables shown. Results based on data from 1199 schoolchildren who completed the pain questionnaire and tested for both hypermobility and physical fitness.

* Not entered in the multivariate model.

^a Measured in ml/kg/min, categorized into 3 groups (below the 25^th percentile (low), between the 25^th and the 75^th percentiles (average), and above the 75^th percentile (high)