Table 1. Comparison of env Abs titre, env Abs avidity and nAbs against vaccine strain from the horses inoculated with three env diversity-varied strains, as calculated using a linear mixed effects model.

env diversity	titre of env-specific Abs		avidity of env-specific Abs		nAbs against vaccine strain
	T value	P-value	T value	P-value	T value	P-value
EIAV_MD (Ref)
EIAV_HD	3.367	0.001	2.994	0.009	4.92	3.19E-06
EIAV_MD (Ref)
EIAV_LD	−0.5398	0.591	−2.367	0.032	0.518	0.605

Note: A linear mixed effects model was used here to compare three indicators (env Abs titre, env Abs avidity and nAbs against the vaccine strain) in the different env diversity-varied groups of horses. P < 0.01 indicated statistical significance.