Table 2.

General linear mixed models for associations between circulating corticosterone (CORT), immune parameters and covariates.

Response variable	Predictor variable	N	Estimate	SE	P
D36 BKA	CORT Treatment	100	−0.47	0.25	0.064
	Hatch Order	100	−0.03	0.02	0.063
	Circulating Baseline CORT D14	100	−0.35	0.13	0.006
	Circ. Base. CORT D14 × CORT Trt	100	0.25	0.16	0.128
	CORT Treatment	98	0.00	0.04	0.993
	Hatch Order	98	−0.03	0.02	0.080
	Circulating Baseline CORT D60	98	−0.15	0.08	0.058
	Circ. Base. CORT D60 × CORT Trt	98	0.13	0.09	0.147
D68 Anti-LPS Ab	CORT Treatment	47	0.28	0.35	0.426
	Circulating Baseline CORT D60	47	0.42	0.60	0.428
	Circ. Base. CORT D60 × CORT Trt	47	−0.23	0.74	0.754
D100 Baseline Hp	CORT Treatment	72	0.02	0.01	0.096
	Clutch Number	72	−0.03	0.01	<.001
	Circulating Baseline CORT D60	72	−0.0	0.02	0.521
	Circ. Base. CORT D60 × CORT Trt	72	−0.01	0.02	0.777
D100 12Hr Hp	CORT Treatment	70	−0.01	0.01	0.711
	Hatch Date	70	0.00	0.00	<.001
	Circulating Baseline CORT D60	70	0.03	0.02	0.089
	Circ. Base. CORT D60 × CORT Trt	70	−0.01	0.02	0.538
D60 Baseline CORT	CORT Treatment	98	0.58	0.59	0.335
	Circulating Baseline CORT D14	98	0.72	0.32	0.001
	Circ. Base. CORT D14 × CORT Trt	98	−0.19	0.38	0.625
D60 Stress CORT	CORT Treatment	99	0.84	0.61	0.171
	Clutch	99	0.08	0.05	0.099
	Circulating Baseline CORT D14	99	0.33	0.32	0.836
	Circ. Base. CORT D14 × CORT Trt	99	−0.58	0.38	0.134

Estimate is the regression coefficient for each predictor and response variable. Bacteria killing ability (BKA) on day 36 was negatively related to CORT concentrations measured on day 14 post-hatch. CORT concentrations measured on day 14 were positively related to baseline CORT concentrations measured on day 60 post-hatch. Base=baseline, Anti-LPS Ab=specific antibodies to LPS, Clutch number=number of clutches parents had produced, Hp=haptoglobin, 12-Hr Hp=haptoglobin concentrations measured 12 hours after LPS challenge, Trt=treatment. Significant (p<0.05) effects are bolded.