TABLE 3.

P‐values and 95% confidence intervals for the effect of season and breed on plasma oxidative markers determined by linear mixed effects modeling with a random effect for animal.

	P	95% CI
Effect of season on dROM	0.19	−14.22—2.95
Effect of breed on dROM	0.07	−1.33—32.87
Effect of the interaction between season and breed on dROM	0.23	−6.72—27.61 −27.61—6.72
Effect of season on PAC	0.001	−438.0 to −111.6
Effect of breed on PAC	0.44	−233.1—103.4
Effect of the interaction between season and breed on PAC	0.09	−46.50—606.2 −606.2—46.50

Note: Concentrations of derivatives of reactive oxygen metabolites (dROM) and plasma antioxidant capacity (PAC) were determined in 34 healthy Welsh ponies and 14 Quarter horses in May and October of the same year. Bold text indicates statistical significance (p < 0.05).