Table 2.

The relationship between herd management variables and selenium (Se) status

Management variable	OR	sχ̄	P-valuea	CI
Provide Se in a commercial ration	4.1	2.5	0.023	[1.21	13.85]
Inject Se at calving	6.3	9.0	0.197	[0.39	102.76]
Use total mixed ration	3.9	3.7	0.144	[0.63	24.55]
Provide Se in free choice mineral for dry cows and heifers	0.18	0.17	0.071	[0.03	1.15]

OR — Odds ratio. Indicates how much greater were the odds of Se-adequacy for herds in which this management practice was employed, when compared with herds in which this management practice was not employed; s_χ̄− — Standard error of the OR; CI — 95% confidence interval for the OR

^aStep-wise logistic regression with variables retained in the model if P <0.2; n = 68 and model pseudo R² = 0.123