Factors associated with lung cytology as obtained by non-endoscopic broncho-alveolar lavage in group-housed calves

Table 2 Final multivariable linear model for the association of clinical signs and broncho-alveolar lavage fluid characteristics with neutrophil percentage in broncho-alveolar lavage fluid of 335 group-housed calves

Variable	Category	Regression coefficient β (SE)	P-value	LSM estimate (SE)
Intercept		20.4 (0.14)	< 0.001
P. multocida culture	Negative	Referent		22.7 (0.11)
P. multocida culture	Positive	0.32 (0.10)	0.005	30.3 (0.13)
Tracheal cough reflex	Negative	Referent		22.7 (0.10)
Tracheal cough reflex	Positive	0.32 (0.15)	0.04	30.3 (0.16)
Posture	Sternal recumbency	Referent		21.4 (0.19)
Posture	Standing	0.47 (0.19)	0.03	32.1 (0.08)
Breathing frequency (breaths/min)		0.01 (0.0)	0.02	-

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