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Table 6 Linear mixed model on the annual basal area growth (mm2·yr.−1) of all analyzed trees (response variable) with the individual tree code as random effect and fixed effects growing site (urban and rural) and the de Martonne index with interactions, SD: Standard deviation, AIC: Akakike Information Criterion

From: Effects of the urban heat island and climate change on the growth of Khaya senegalensis in Hanoi, Vietnam

Parameter Fixed effect Value ± SE p
A Intercept −7.14 ± 0.16 <  0.001
log(age) Age 1.61 ± 0.01 <  0.001
Urbanity grade ij Grade of Urbanity 1.89 ± 0.19 <  0.001
log(Mij) De Martonne Index 0.04 ± 0.03 0.27
b x log(urbanity gradeij) x log(age) Grade of Urbanity x Age −0.50 ± 0.02 <  0.001
b x urbanity gradeij x log(Mij) Grade of Urbanity x de Martonne Index −0.03 ± 0.04 0.38
Random effect dij   0.52
ε   0.17
AIC   − 2451.83
  1. Levels of Urbanity: 2 (Urban and Rural)