Table 7.

Results of multilevel model predicting nociceptive flexion reflexes during temporal summation

Estimates of Fixed Effects					95% CI
Parameter	Estimate	SE	t-test	p-value	Lower	Upper
Intercept	1.013	0.053	19.038	<0.001	0.908	1.117
Ethnicity	−0.033	0.028	−1.163	0.246	−0.088	0.023
Stimulus Number (Summation)	0.270	0.017	16.323	<0.001	0.237	0.302
Discrimination	−0.080	0.179	−0.449	0.654	−0.432	0.271
Summation x Ethnicity	0.015	0.017	0.933	0.352	−0.017	0.048
Summation x Discrimination	0.186	0.091	2.034	0.043	0.006	0.366
Ethnicity x Discrimination	−0.096	0.147	−0.654	0.514	−0.386	0.194
Summation x Ethnicity x Discrimination	−0.020	0.091	−0.221	0.825	−0.200	0.160
Train Number	−0.020	0.004	−1.420	<0.001	−0.028	−0.011
Stimulus Intensity	0.002	0.002	0.663	0.508	−0.003	0.006
Trauma Exposure	0.012	0.017	0.695	0.488	−0.022	0.046
Sex	−0.022	0.025	−0.863	0.389	−0.071	0.028
Education	−0.079	0.037	−2.116	0.035	−0.152	−0.005
Income	0.020	0.013	1.482	0.140	−0.006	0.046
General Health Perception	−0.002	0.002	−0.795	0.427	−0.005	0.002
Age	0.006	0.004	1.306	0.193	−0.003	0.014
BMI	−0.002	0.007	−0.321	0.749	−0.015	0.011
Stress	0.005	0.006	0.819	0.413	−0.007	0.017
Psych Distress	−0.140	0.447	−0.314	0.754	−1.021	0.740
Blood Pressure	−0.001	0.003	−0.279	0.781	−0.007	0.006
Estimates of Random Effects					95% CI
Parameter	Estimate	SE	z-test	p-value	Lower	Upper
AR1 diagonal	0.128	0.003	39.247	<0.001	0.122	0.134
AR1 rho	0.089	0.019	4.634	<0.001	0.051	0.126
Intercept Variance	0.145	0.015	9.615	<0.001	0.118	0.178
Intercept, Summation Covariance	−0.028	0.007	−3.719	<0.001	−0.042	−0.013
Summation Variance	0.055	0.006	9.097	<0.001	0.044	0.068

Note: Stimulus Number/Summation=codes for temporal summation; AR=autoregressive; Bolded values are associated with significant estimates. Ethnicity was coded 0=non-Hispanic White, 1=Native American. Sex was coded 0=male, 1=female.