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Table 3 Safe depths of 23 upper back acupoints of age groups

From: Safe needling depths of upper back acupoints in children: a retrospective study

Points 4–6 y/o (n = 79) 7–9 y/o (n = 45) 10–12 y/o (n = 30) 13–15 y/o (n = 56) 16–18 y/o (n = 109) P value
Mean ± S.D. Mean ± S.D. Mean ± S.D. Mean ± S.D. Mean ± S.D.
GV9 19.31 ± 2.84 23.32 ± 6.17 27.20 ± 7.54 29.83 ± 8.04 31.83 ± 8.55 <0.001a
GV10 20.70 ± 3.62 23.64 ± 4.93 28.86 ± 6.12 29.88 ± 7.74 32.84 ± 8.31 <0.001a
GV11 22.14 ± 4.80 22.96 ± 4.52 27.70 ± 6.19 29.56 ± 7.56 31.71 ± 8.29 <0.001a
GV12 22.26 ± 4.54 25.93 ± 5.59 30.75 ± 7.58 32.40 ± 8.73 34.63 ± 10.16 <0.001a
GV13 23.02 ± 5.59 29.18 ± 7.70 35.75 ± 8.25 35.78 ± 7.99 38.26 ± 8.65 <0.001a
GV14 23.26 ± 4.95 26.57 ± 8.05 33.20 ± 9.48 37.83 ± 8.79 39.29 ± 9.54 <0.001a
BL11 24.93 ± 5.44 28.71 ± 8.00 31.29 ± 7.86 36.07 ± 10.53 36.01 ± 10.63 <0.001a
BL12 28.54 ± 8.50 32.57 ± 8.48 34.43 ± 8.24 37.74 ± 8.56 37.78 ± 8.33 <0.001a
BL13 24.82 ± 2.74 25.01 ± 3.00 26.53 ± 4.55 29.17 ± 7.57 30.68 ± 8.04 <0.001a
BL14 18.90 ± 2.66 21.35 ± 4.32 24.67 ± 6.53 26.42 ± 8.14 27.71 ± 8.48 <0.001a
BL15 20.94 ± 3.46 23.42 ± 4.57 24.45 ± 5.36 26.72 ± 6.45 27.65 ± 6.78 <0.001a
BL16 18.23 ± 2.76 21.12 ± 5.04 23.96 ± 5.37 25.32 ± 7.26 26.79 ± 7.50 <0.001a
BL17 19.14 ± 2.85 22.56 ± 4.03 25.60 ± 5.33 26.98 ± 6.76 28.33 ± 6.89 <0.001a
BL41 24.77 ± 3.51 25.32 ± 5.99 27.74 ± 6.44 33.75 ± 8.96 34.17 ± 9.95 <0.001a
BL42 21.97 ± 3.88 24.86 ± 5.50 28.20 ± 7.28 29.49 ± 8.15 31.30 ± 9.28 <0.001a
BL43 19.41 ± 3.74 21.92 ± 4.32 24.29 ± 6.19 25.60 ± 7.95 27.46 ± 8.14 <0.001a
BL44 15.21 ± 5.67 18.72 ± 5.42 19.68 ± 5.99 21.65 ± 7.61 22.99 ± 8.04 <0.001a
BL45 13.14 ± 3.39 15.84 ± 4.47 19.43 ± 6.47 20.26 ± 6.46 21.32 ± 7.53 <0.001a
BL46 12.74 ± 2.35 15.24 ± 3.58 19.34 ± 6.04 19.53 ± 6.45 21.01 ± 7.00 <0.001a
SI14 26.30 ± 6.29 30.88 ± 9.25 34.18 ± 10.28 40.32 ± 11.41 41.31 ± 11.91 <0.001a
SI15 26.92 ± 4.94 31.77 ± 7.65 39.52 ± 9.72 43.85 ± 12.10 43.17 ± 10.54 <0.001a
GB21 20.84 ± 3.25 23.70 ± 4.99 30.16 ± 9.14 28.94 ± 8.97 32.45 ± 10.06 <0.001a
SP21 16.97 ± 2.89 16.88 ± 2.18 19.89 ± 3.25 19.99 ± 4.44 21.34 ± 5.17 <0.001a
  1. Unit of mean ± SD: mm
  2. aStatistically significant