Table 5. Results of the final random intercept 2-level (flock-fillet) multivariable regression model for woody breast, in a cohort of 9,250 chicken breast fillets collected at two processing plants between 2019–2020 in Ontario, Canada (n = 9,250 fillets).

	Variable	Value	Odds Ratio	P value		95% CI
Flock demographics	Average live weight (g)	Low (1,940–2,290)	Reference
		Medium (2,300–2,450)	1.18	0.042		1.01–1.38
		High (2,460–2,360)	1.23	0.020		1.03–1.47
	Source of chicks	Domestic	1.32	0.028		1.03–1.69
		Mixed	1.10	0.574		0.79–1.54
		USA	Reference
Flock health	Mortality rate during grow-out (%)	Low (1.25–2.0)	1.79	<0.001		1.43–2.25
		Medium (2.1–3.0)	1.76	<0.001		1.42–2.17
		High (3.1–5.8)	Reference
	Coccidiosis vaccine	Administered	Reference
		Not administered	1.86	<0.001		1.51–2.29
Transportation	Birds per crate	Low (8–9)	Reference
		Medium (9.5–10)	0.83	0.199		0.62–1.10
		High (10.5–12)	1.46	<0.001		1.18–1.79
	Dead on arrival (%)	0–0.16	1.04	<0.001		1.02–1.05
	Loading duration (min)	Low (40–75)	Reference
		Medium (76–100)	1.19	0.111		0.96–1.47
		High (101–150)	1.48	0.001		1.18–1.86
Processing plant	Hold time on lairage at plant (min)	Low (10–110)	1.31	0.014		1.06–1.61
		Medium (111–160)	Reference
		High (161–269)	1.52	<0.001		1.24–1.86
Environmental	Season	Spring	1.06	0.782		0.65–1.71
		Summer	1.33	0.020		1.05–1.70
		Fall	1.19	0.436		0.79–1.82
		Winter	Reference