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Table 2 Frequency of neck, mid back, and low back pain at age 11–13 and two years later

From: Spinal pain in adolescents: prevalence, incidence, and course: a school-based two-year prospective cohort study in 1,300 Danes aged 11–13

  11-13 yr. (n = 1291) 13-15 yr. (n = 1064)
   Girls (n = 625) Boys (n = 666) Girls (n = 499) Boys (n = 565)
Location Frequency n % 95% CI n % 95% CI n % 95% CI n % 95% CI
NP Never 134 21.4 18.2, 24.7 176 26.4 23.1, 29.8 91 18.2 14.9, 21.6 155 27.4 23.8, 31.1
  Once/twice 264 42.2 38.4, 46.1 252 37.8 34.2, 41.5 177 35.5 31.3, 39.7 194 34.3 30.4, 38.3
  Sometimes 179 28.6 25.1, 32.2 196 29.4 26.0, 32.9 183 36.7 32.4, 40.9 168 29.7 26.0, 33.5
  Often 48 7.7 5.6, 9.8 42 6.3 4.5, 8.2 48 9.6 7.0, 12.2 48 8.5 6.2, 10.8
  Missing values 0    0    0    0   
MBP Never 243 38.9 35.1, 42.7 278 41.8 38.1, 45.5 160 32.1 38.0, 36.2 228 40.4 36.4, 44.5
  Once/twice 234 37.4 33.6, 41.2 229 34.4 30.8, 38.1 180 36.1 31.9, 40.3 183 32.5 28.6, 36.3
  Sometimes 112 17.9 14.9, 20.9 115 17.3 14.4, 20.2 117 23.5 19.7, 27.2 108 19.2 15.9, 22.4
  Often 36 5.8 3.9, 7.6 43 6.5 4.6, 8.3 42 8.4 6.0, 10.9 45 8.0 5.7, 10.2
  Missing values 0    1    0    1   
LBP Never 321 51.5 47.6, 55.4 394 59.3 55.5, 63.0 205 41.2 36.8, 45.5 306 54.3 50.1, 58.4
  Once/twice 191 30.7 27.0, 34.3 181 27.2 23.8, 30.6 141 28.3 24.4, 32.3 143 25.4 21.8, 28.9
  Sometimes 73 11.7 9.2, 14.2 64 19.6 7.4, 11.9 92 18.5 15.1, 21.9 86 15.3 12.3, 18.2
  Often 38 6.1 4.2, 8.0 26 3.9 2.4, 5.4 60 12.1 9.2, 14.9 29 5.1 3.3, 7.0
  Missing values 2    1    1    1   
  1. CI = Confidence intervals; LBP = Low back pain; MBP = Mid back pain; NP = Neck pain.