Table 4.

Multiple regression results for number of starts at 2 years for OC-affected horses (n = 133). DIRT = distal intermediate ridge of the tibia. MM = medial malleolus of the tibia. LTR = lateral trochlear ridge of the talus; bilat = bilateral; G = gelding; M = mare; S = stallion; P = pace; T = trot. Reference states for these binomial predictor variables were unaffected (no) for lesion location and unilateral (bilat [no]) for lesion distribution.

Outcome Variable	Predictor Variable	Estimate (IRR)	2.5%	97.5%	p-value
Starts (number)	DIRT (yes)	0.922376	0.507378	1.674533	0.782
	MM (yes)	0.865829	0.462288	1.667035	0.617
	LTR (yes)	0.556934	0.321267	0.980599	0.033
	bilat (yes)	0.599865	0.356129	1.004136	0.03
	gender(G)	REF	n/a	n/a	n/a
	gender (M)	0.575455	0.340365	0.969076	0.031
	gender(S)	0.470114	0.25938	0.860978	0.011
	gait (P)	REF	n/a	n/a	n/a
	gait (T)	0.450336	0.275834	0.728408	0.001