Model

MAE

RSME

Our model

y = 6.84x² − 45.86x + 81.52 (R² = 0.494, p < 0.01, n = 394)

11.85

15.40

Mao et al. (2005) [8]

y = −8.455x² + 115.54x − 305.28 (R² = 0.854, p < 0.01, n = 71)

33.01

36.70

Li et al. (2012) [9]

y = −2.067x² + 52.687x − 203.08 (R² = 0.703, p < 0.01, n = 30)

19.99

24.30