Table 2.

Species-specific prediction models of trunk flare diameter (TFD) using diameter at breast height (DBH) with (a) all trees under each individual species and (b) only trees with protruding roots and/or flares.

		Intercept			Regression coefficient of DBH
		R²	b₀	SE	b₁	SE	CI_LOW	CI_up
(a) All trees under each individual species	A. moluccanus	0.563	−0.406	0.108	3.645	0.361	2.925	4.365
	A. alexandrae	0.804	0.005	0.017	2.004	0.131	1.742	2.266
	B. ceiba	0.626	−0.136	0.076	2.399	0.219	1.962	2.836
	C. equisetifolia	0.781	−0.066	0.037	2.766	0.135	2.498	3.304
	C. burmannii	0.644	−0.160	0.077	3.715	0.336	3.044	4.386
	D. regia	0.655	−0.559	0.134	4.495	0.381	3.736	5.254
	F. altissima	0.366	1.717	0.155	1.044	0.178	0.687	1.400
	F. micro carpa	0.518	0.829	0.089	2.076	0.178	1.723	2.429
	L. speciosa	0.590	0.009	0.022	1.662	0.160	1.343	1.982
	M. cajuputi	0.667	−0.090	0.039	2.632	0.169	2.298	2.966
	M. × alba	0.792	0.048	0.018	1.076	0.100	0.871	1.282
	P. serratifolia	0.686	−0.150	0.014	1.944	0.177	1.589	2.298
	S. campanulata	0.738	−0.100	0.039	2.405	0.145	2.117	2.693
	X. chrysanthus	0.333	0.043	0.015	1.193	0.209	0.775	1.611
(b) Only trees with protruding roots and/or flares	A. moluccanus	0.422	−0.078	0.246	3.251	0.703	1.809	4.693
	B. ceiba	0.550	−0.099	0.138	2.508	0.364	1.771	3.245
	C. equisetifolia	0.684	0.224	0.097	2.222	0.274	1.662	2.782
	C. burmannii	0.510	−0.085	0.133	3.565	0.533	2.489	4.642
	D. regia	0.655	−0.442	0.182	4.464	0.486	3.484	5.444
	F. altissima	0.348	1.792	0.153	0.968	0.174	0.619	1.317
	F. microcarpa	0.516	0.846	0.090	2.053	0.721	1.699	2.408
	M. cajuputi	0.399	0.031	0.141	2.601	0.479	1.635	3.567
	S. campanulata	0.441	0.028	0.185	2.305	0.506	1.260	3.351

The proportion of explained variance (R²) of simple linear regression, intercept (b₀) and regression coefficient of DBH (b₁), and its standard errors (SE) were provided. The lower and upper boundary values of confidence intervals (CI_LOW, CI_UP) were computed for more conservative estimation. Significant values of R² and b₁ with P < 0.05 were italicised and underlined for easier comparison. Five species, namely A. alexandrae, L. speciosa, M. × alba, P. serratifolia, and X. chrysanthus, were excluded in (b) due to insufficient sample size.