order m

Estimated Coefficients (p-values)

R²

REMARK

${\widehat{C}}_0$

${\widehat{C}}_1$

${\widehat{C}}_2$

${\widehat{C}}_3$

${\widehat{C}}_4$

1

−1.033

(0.636)

0.219

(0.000)

55.0%

Linear Trend

2

37.781 (0.000)

−0.4242 (0.000

1.782 × 10⁻³

(0.000)

86.4%

Quadratic trend

3

30.198

(0.000)

−0.1739

(0.000)

5.07 × 10⁻⁵

(0.888)**

3.20 × 10⁻⁶

(0.000)

87.30%

Cubic Trend

4

26.462

(0.000)

0.0305

(0.786)**

−0.0025

(0.05)**

1.413 × 10⁻⁵

(0.000)

−2.0 × 10⁻⁸

(0.036)

87.4%

Quartic trend