Table 4. Final multiple regression analysis model for the effects of area of vascular bundles within the scar and the thickness of the vascularised inner layer of the main pericarp on the rate of water uptake for 9 species of Quercus.

Term	d.f.	Coefficient	t-value
Final reduced model
Vascular bundle area (mm2)	6	1.022	2.51*
Vascularised inner layer thickness (mm)	6	0.07725	2.59*

The initial full model also included the effects of the area of the apex, cuticle thickness and phylogeny (subgenus Cyclobalanopsis versus subgenus Quercus). However these terms were not significant and were dropped during the backwards elimination process.

^*P<0.05.