54 Chapter 3 Table 3. Estimates (95%CI, p-value) of the effect of the parameters on the different HRET metrics derived from the multiple quantile regression analysis adjusted for age, height (cm), mass, BMI, sex and physical activity level (PAL). Examples on how to employ the normative equations based on two fictional patients are provided in the lower part of the table. Parameter Repetitions Total work Vertical displacement Peak height Intercept 41.2 (35.4, 47.0) -2084 (-3329, -839) 156.7 (-25.7, 339.2) 3.3 (-2.4, 9.0) Age XX XX XX XX Height †† 19.5 (12.1, 27.0) 1.0 (0.8, 2.0) 0.044 (0.015, 0.074) BMI -0.61 (-0.84, -0.38) XX -5.5 (-7.4, -3.5) -0.069 (-0.13, -0.10) Mass XX 2.6 (-2.0, 7.3) XX XX Gender -2.7 (-4.4, -1.1) -164.3 (-296.8, -31.8) -12.8 (-31.2, 5.7) †† PAL 2 3.6 (-3.8, 10.9) -211.4 (-649.9, 227.1) -18.7 (-79.8, 42.4) XX PAL 3 -2.6 (-5.4, 0.27) -185.3 (-354.1, -16.6) -29.4 (-52.9, -5.9) XX PAL 4 -0.93 (-3.3, 1.4) -135.6 (-275.8, 4.6) -22.4 (-41.9, -2.8) XX PAL 5 0.43 (-1.6, 2.5) 33.9 (-86.2, 154.1) 5.9 (-10.9, 22.6) XX Normative equation* Intercept + age + height + BMI + gender + PAL Example A Female, 53 years, 29 kg/m2, 165 cm, 79 kg, PAL 3 Example B Male, 25 years, 21 kg/m2, 184 cm, 71 kg, PAL 5 Repetitions** 41.2 – 0.61 x (BMI) – 2.7 x (gender) + PAL A: 18 (12 – 33) 41.2 – 0.61 x (29) -2.7 x (1) – 2.6 B: 29 (16 – 55) 41.2 – 0.61 x (21) -2.7 x (0) + 0.43 Total work** -2084 + 19.5 x (height) + 2.6 x (mass) – 164.3 x (gender) + PAL A: 989.3 (531.7-1651.0) J -2084 + 19.5 x (165) + 2.6 x (79) – 164.3 x (1) – 185.3 B: 1722.5 (824.6-3108.2) J -2084 + 19.5 x (184) + 2.6 x (71) – 164.3 x (0) + 33.9 Vertical displacement** 156.7 + 1.0 x (height) – 5.5 x (BMI) -12.8 x (gender) + PAL A: 126 (69-246) cm 156.7 + 1.0 x (165) – 5.5 x (29) – 6.5 x (1) – 29.4 B: 231 (117-430) cm 156.7 + 1.0 x (184) – 5.5 x (21) – 6.5 x (0) + 5.9 Peak height** 3.3 + 0.044 x (height) – 0.069 x (BMI) A: 8.6 (5.0-11.7) cm 3.3 + 0.044 x (165) – 0.069 x (29) B: 9.9 (5.8-13.6) cm 3.3 + 0.044 x (184) – 0.069 x (21) * Gender: male = 0, female = 1, PAL 6= 0 ** Values are median (mm) with 95% RI (2.5th percentile, 97.5th percentile) †† Covariate removed from the multiple quantile regression model as it exhibited a weak/negligible (r<0.3)20 correlation coefficient and the removal of the covariate did not impact the model's 'accuracy,' as indicated by the stability of the R2 value. Abbreviations; BMI: Body Mass Index, PAL: Physical Activity Level.
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