Table 4.

Mixed-effects multi-level logistic regression analysis for Mycoplasma hyopneumoniae

Parameter	Odds ratio	Standard error	95% confidence interval	p-value
IAV seropositivity
No	Referent
Yes	2.5	0.62	1.5–4.1	< 0.001
Farrowing source
5	Referent
7	0.34	0.16	0.14–0.86	0.022
8	0.08	0.04	0.03–0.22	< 0.001
Age (weeks)	0.93	0.015	0.90–0.96	< 0.001

This table displays the mixed-effects multi-level logistic regression analysis for Mycoplasma hyopneumoniae seropositivity with sow as a random effect in 4 seropositive groups from 3 farrowing sources. Six groups had more than 20% of pigs test seropositive for M. hyopneumoniae at least once from the end of nursery to the end of finisher by ELISA. However, 2 seropositive groups from 1 farrowing source were excluded from the multivariable analysis as sows and pigs were vaccinated for M. hyopneumoniae

IAV Influenza A virus

^aCohort One: Pigs were born between May and August; Cohort Two: Pigs were born between October and January