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Table 5 Changes in frequency of spinal pain from age 11–13 to 13–15

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

  Frequency of spinal pain 13–15 yr.  
Frequency of spinal pain 11–13 yr. Never (n = 119) Once or twice (n = 345) Sometimes (n = 372) Often (n = 202) Total
n % 95% CI n % 95% CI n % 95% CI n % 95% CI %
Never (n = 158) 51 32.3 25.1, 40.2 60 38.0 30.4, 46.0 44 27.9 21.0, 35.5 3 1.9 0.4, 5.4 100
Once or twice (n = 407) 38 9.3 6.7, 12.6 185 45.5 40.5, 50.4 138 33.9 29.3, 38.7 46 11.3 8.4, 14.8 100
Sometimes (n = 346) 25 7.2 4.7, 10.5 86 24.9 20.4, 29.8 145 41.9 36.7, 47.3 90 26.0 21.5, 31.0 100
Often (n = 127) 5 3.9 1.3, 8.9 14 11.0 6.2, 17.8 45 35.4 27.2, 44.4 63 49.6 40.6, 58.6 100
  1. CI = Confidence intervals. There are 4 missing values in the table.
  2. Proportions of adolescents with different combinations of baseline categories (rows) and follow-up categories (columns).