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Table I

Statistical characteristics of the nonlinear power law model (Eq. (7)). SD = standard deviation, CI = confidence interval (95%), LLV = log-likelihood value, p < 0.001 (with and without variance function, Eq. (8)).

a b SD (a) SD (b) CI (a) CI (b) LLV RSE Adj. R2
Without variance function 1.96 × 10 − 4 2.458 4.42 × 10 − 5 0.047 1.09 × 10 − 4 2.83 × 10 − 4 2.365 2.552 –583.944 2.220 0.95
With variance function (Eq. (8)) 3.24 × 10 − 4 2.351 3.14 × 10 − 5 0.023 2.62 × 10 − 4 3.85 × 10 − 4 2.305 2.396 –347.658 0.241 0.95