Table 3.

Regression Model Predicting Change in Plasma Norepinephrine

	df	ΔF	p	ΔR2	Entered Variables	B	β	p
Step 1	1,66	1.12	.295	.017	Intercept	97.59
					NE Rest	−.07	−.13	.295
Step 2	4,63	3.13	.032	.128	Intercept	72.33
					NE Rest	−.11	−.21	.088
					Age	.95	.09	.517
					Sex	14.30	.07	.594
					Drug	58.92	.30	.017
Step 3	5,62	5.76	.019	.073	Intercept	68.28
					NE Rest	−.10	−.20	.093
					Age	.89	.08	.531
					Sex	29.59	.14	.268
					Drug	73.32	.38	.003
					Stressors	28.79	.30	.019
Step 4	6,61	4.14	.046	.050	Intercept	67.81
					NE Rest	−.10	−.20	.092
					Age	.78	.07	.573
					Sex	32.56	.16	.213
					Drug	75.28	.39	.002
					Stressors	19.38	.20	.129
					Mastery	−9.86	−.25	.046
R2 = .27; Adjusted R2 = .20

Note. NE = Norepinephrine; Drug = Antihypertensive drug use; Stressors = Caregiver primary stressors. Intercept corresponds to the predicted NE reactivity to the acute stress task for a caregiver (regardless of sex) where resting NE was centered at 405 pg/ml, age was centered at 72 years, and Mastery was centered at 19.