Age group

Regression models

R²

RMSE

P-value

2 - 3 yrs

Y = 8.12TL + 1.99

0.91

4.17

<0.0001

Y = 16.94NL + 17.83

0.52

9.85

0.0047

Y = 4.83HG + 15.87

0.81

6.11

<0.0001

Y = 4.88FC + 6.19

0.79

7.12

<0.0001

Y = 21.03RW + 14.42

0.93

3.60

<0.0001

Y = 2.35CD + 12.33

0.90

4.49

<0.0001

4 - 5 yrs

Y = 9.60TL + 2.12

0.95

2.01

<0.0001

Y = 8.24NL + 35.55

0.33

8.29

0.0495

Y = 3.27HG + 26.46

0.68

5.41

0.0005

Y = 3.18FC + 21.31

0.77

4.61

0.0001

Y = 19.37RW + 15.45

0.91

2.79

<0.0001

Y = 3.20CD + 18.70

0.51

6.77

0.0054

Overall

Y = 8.00TL + 6.20

0.82

4.97

<0.0001

Y = 12.01NL + 27.81

0.38

9.41

0.0007

Y = 4.13HG + 20.49

0.76

5.88

<0.0001

Y = 4.02FC + 13.48

0.77

5.69

<0.0001

Y = 20.16RW + 14.90

0.92

3.21

<0.0001

Y = 2.75CD + 20.31

0.71

6.43

<0.0001