Table 4.

Odds ratios (OR) and 95% confidence intervals (CI) for pregnancy risk by time and farm

	OR	95% CI	P
Time to AI *
<12 h	0.71	0.33–1.51	0.38
12–24 h	Baseline
>24 h	1.13	0.55–2.32	0.74
Farm
1	Baseline
2	0.73	0.36–1.48	0.38
3	1.38	0.66–2.92	0.39
4	0.06	0.01–0.54	0.01
5	5.39	0.65–44.94	0.12

*Time from automatic activity monitoring system alarm of oestrus until articicial insemination