| 10–19 years of age | 6–17 years of age | |||||||
---|---|---|---|---|---|---|---|---|---|
 | Incidence, % | Prevalence, % | Prevalence, % | ||||||
Anatomic Region/Site | 6Â months | 12Â months | Point | Often/ usually | Weekly | 2Â weeks | Monthly | 6Â months | Lifetime |
Upper extremity in general | 19.9 [37] | 13.3 [37] |  | 9.4–11.7 [51] | 3.9–4.0 [38] | 2.7 [40] | 3.6–4.2 [36] |  |  |
Shoulder | 8 [37] | 5 [37] | 13.3 [42] | 6–14 [52] |  |  |  | 33–63 [50] |  |
Arm | 9 [37] | 7 [37] | Â | Â | Â | Â | Â | Â | Â |
Elbow |  |  | 2.6 [42] | 4 [52] |  |  |  | 2–5 [50] |  |
Wrist/hand/fingers |  |  | 4.4 [42] | 5–7 [52] |  |  |  | 15–23 [50] |  |
Lower extremity in general | 21 [43] | 16 [43] |  | 28.9–31.9 [51] | 8.6–12.8 [38] | 12.4 [40] |  |  |  |
Hip/groin | 7 [43] | 4 [43] | 5.9 [42] | 5–7 [52] |  |  |  |  |  |
Thigh | Â | Â | 2.7 [42] | Â | Â | Â | Â | Â | Â |
Knee | 13 [43] | 11 [43] | 32.3 [42] | 29–32 [52] |  | 6.5 [40]a | 25 [48] | 17–21 [50] |  |
Shin | Â | Â | 6.2 [42] | Â | Â | Â | Â | Â | Â |
Ankle/ft | 14 [43] | 8 [43] | 11.5 [42] | 7–12 [52] |  | 5.5 [40] |  | 15–19 [50] | 3.5 [49] |