Table 2 The most significant measured COM values at different key instances during swing. Data are means (±SD). Golfer level p-value Advanced Intermediate Novice Number of Swings - 12 21 21 Maximum arm speed (m·s-1) 0.001 6.43 (.77) 4.99 (0.89) 4.78 (.61) COM Area Between tMAS and tAdd (cm2) 0.001 2.25 (1.96) 5.27 (3.81) 8.34 (5.77) COM Area Between tTBS and tMAS (cm2) 0.05 20.95 (6.56) 15.93 (10.34) 10.21 (12.91) COM Area Between tAccMax and tImpact (cm2) 0.05 32.12 (29.27) 21.82 (16.67) 13.21 (16.66) Normalized COMA-P by arm velocity Between tUP and tImpact (sec/100) 0.001 1.29 (.22) 1.33 (.31) 1.65 (.28) Normalized COM Area by arm velocity Between tUP and tMAS (cm·sec/100) 0.001 5.48 (1.43) 4.80 (1.96) 9.58 (4.47)