Table 2.

Safe depth of 28 chest acupoints in different sex.

Acupoints	Boys	Girls	P value
	Mean ± S.D.	Mean ± S.D.
CV22	22.39 ± 7.04	22.82 ± 7.20	0.61
CV21	5.86 ± 4.56	6.20 ± 4.70	0.54
CV20	6.14 ± 4.02	6.51 ± 4.12	0.44
CV19	5.73 ± 2.94	6.76 ± 4.22	0.11
CV18	6.34 ± 4.77	6.84 ± 4.08	0.35
CV17	6.75 ± 4.69	7.67 ± 5.02	0.10
CV16	9.48 ± 4.86	9.70 ± 5.53	0.72
KI27	27.50 ± 10.08	27.67 ± 9.56	0.88
KI26	17.15± 6.71	18.37 ± 8.20	0.15
KI25	15.66 ± 5.54	17.61 ± 7.28	0.008∗
KI24	14.75 ± 4.72	15.46±6.93	0.33
KI23	13.99 ± 4.78	14.23 ± 6.79	0.74
KI22	13.85 ± 5.05	14.08 ± 6.52	0.72
ST13	33.24 ± 13.83	34.57 ± 15.36	0.44
ST14	21.96 ± 8.27	22.72 ± 12.67	0.57
ST15	18.47 ± 7.57	20.50 ± 11.29	0.06
ST16	15.57 ± 6.21	17.75 ± 10.42	0.04∗
ST17	13.94 ± 5.27	14.95 ± 8.21	0.24
ST18	13.35 ± 4.82	14.96 ± 7.33	0.04∗
LU2	40.60 ± 17.10	35.07 ± 17.74	0.007∗
LU1	25.79 ± 10.16	26.40 ± 13.29	0.67
SP20	19.41 ± 7.28	22.29 ± 13.07	0.03∗
SP19	16.40 ± 6.00	19.31 ± 11.12	0.01∗
SP18	14.89 ± 5.36	15.34 ± 8.29	0.60
SP17	13.38 ± 3.96	14.99 ± 6.49	0.02∗
PC1	14.37 ± 4.61	16.54 ± 8.23	0.01∗
GB23	17.14 ± 5.95	16.38 ± 7.12	0.31
GB22	20.34 ± 8.15	17.46 ± 8.32	0.003∗

The unit of mean ± S.D. is mm.

^∗Statistical significance.