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Table 2 The equations for Z score loci by gender

From: Upper arm circumference development in Chinese children and adolescents: a pooled analysis

Girls Boys
Y 0 = 15.508e0.0321X R 2 = 0.9703 Y 0 = 15.428e0.0361X R 2 = 0.9637
Y + 3 = 22.786e0.0349X R 2 = 0.8277 Y + 3 = 23.293e0.0402X R 2 = 0.8389
Y + 2 = 20.447e0.0341X R 2 = 0.8883 Y + 2 = 21.089e0.0384X R 2 = 0.8704
Y + 1 = 18.491e0.0332X R 2 = 0.9263 Y + 1 = 18.777e0.0383X R 2 = 0.8965
Y − 1 = 13.458e0.0294X R 2 = 0.9563 Y − 1 = 13.235e0.0337X R 2 = 0.8437
Y − 2 = 12.724e0.0235X R 2 = 0.9178 Y − 2 = 11.136e0.0337X R 2 = 0.8546