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Table 1 Stage of puberty by pain location according to sampling scheme, showing significant trend towards more low back pain and back pain anywhere with more advanced pubertal stage df = 1 for both calculations, chi-square = 42.9 and 17.29, p < 0.0001 for both calculations.

From: Back pain reporting in young girls appears to be puberty-related

3rd grade Pain location Puberty stage 1 Puberty stage 2 Puberty stage 3 Puberty stage 4 Puberty stage 5 Total (%)
  No pain 126 46 1 0 0 173 (68.7%)
  Low back pain 3 1 0 1 0 5 (2.0%)
  Mid back pain 30 15 1 1 0 47 (18.7%)
  Neck pain 19 5 2 0 0 26 (10.3%)
  Pain in two locations 0 1 0 0 0 1 (0.4%)
  Back pain anywhere 52 22 3 2 0 79 (31.4%)
  Total 178 68 4 2 0 252 (100%)
9th grade        
  No pain 1 0 7 36 36 80 (49.7%)
  Low back pain 0 0 2 18 15 35 (21.7%)
  Mid back pain 0 0 3 12 14 29 (18.0%)
  Neck pain 0 0 0 6 4 10 (6.2%)
  Pain in two locations 0 0 0 2 5 7 (4.3%)
  Back pain anywhere 0 0 5 38 38 81 (50.3%)
  TOTAL 1 0 12 74 74 161