Table 4. Results of the final random intercept 2-level (flock-fillet) multivariable logistic regression model for spaghetti meat, in a cohort of 9,250 chicken breast fillets collected at two processing plants between 2019–2020 in Ontario, Canada.

	Variable	Value	Odds Ratio	P value	95% CI
Flock demographics	Average live weight (g)	Low (1940–2290)	Reference
		Medium (2300–2450)	1.13	0.352	0.87–1.47
		High (2460–2630)	1.30	0.044	1.01–1.69
	Source of chicks	Domestic	Reference
		Mixed	0.91	0.610	0.63–1.31
		USA	1.50	0.043	1.01–2.23
Flock health	Coccidiosis vaccine	Administered	1.46	0.018	1.07–2.00
		Not administered	Reference
	Infectious bursal disease vaccine	Administered	1.84	< 0.001	1.32–2.54
		Not administered	Reference
Transportation	Truck travel time (min)	Low (20–68)	1.64	0.002	1.21–2.22
		Medium (69–163)	1.89	< 0.001	1.43–2.49
		High (164–798)	Reference
Processing plant	Hold time on lairage at plant (min)	Low (10–110)	1.26	0.092	0.96–1.64
		Medium (111–160)	1.35	0.038	1.02–1.80
		High (161–269)	Reference
Environmental	Temperature during grow-out (°C)	Low (-9.8–0)	Reference
		Medium (0.1–15.7)	2.58	< 0.001	1.96–3.39
		High (15.8–22.7)	1.75	< 0.001	1.31–2.34