Table 6.

Results of multilevel model predicting pain ratings during temporal summation

Estimates of Fixed Effects					95% CI
Parameter	Estimate	SE	t-test	p-value	Lower	Upper
Intercept	45.414	3.104	14.633	<0.001	39.301	51.526
Ethnicity	0.709	1.576	0.450	0.653	−2.396	3.814
Stimulus Number (Summation)	3.055	0.240	12.747	<0.001	2.583	3.527
Discrimination	0.849	10.333	0.082	0.935	−19.504	21.202
Summation x Ethnicity	0.209	0.240	0.873	0.383	−0.263	0.681
Summation x Discrimination	1.760	1.324	1.329	0.185	−0.849	4.369
Ethnicity x Discrimination	2.568	8.206	0.313	0.755	−13.598	18.734
Summation x Ethnicity x Discrimination	0.719	1.324	0.543	0.588	−1.890	3.328
Train Number	1.651	0.156	10.550	<0.001	1.343	1.958
Stimulus Intensity	0.535	0.134	3.992	<0.001	0.271	0.799
Trauma Exposure	0.736	1.012	0.728	0.467	−1.257	2.729
Sex	−0.340	1.475	−0.231	0.818	−3.245	2.564
Education	0.848	2.209	0.384	0.701	−3.504	5.199
Income	0.484	0.785	0.616	0.538	−1.063	2.030
General Health Perception	−0.171	0.114	−1.496	0.136	−0.396	0.054
Age	−0.261	0.258	−1.012	0.312	−0.769	0.247
BMI	0.746	0.390	1.915	0.057	−0.021	1.514
Stress	−0.639	0.347	−1.845	0.066	−1.322	0.043
Psych Distress	36.897	26.272	1.404	0.161	−14.855	88.649
Blood Pressure	−0.220	0.193	−1.138	0.256	−0.601	0.161
Estimates of Random Effects					95% CI
Parameter	Estimate	SE	z-test	p-value	Lower	Upper
AR1 diagonal	83.465	3.131	26.661	<0.001	77.549	89.832
AR1 rho	0.272	0.030	9.057	<0.001	0.212	0.330
Intercept Variance	474.538	44.641	10.630	<0.001	394.635	570.618
Intercept, Summation Covariance	16.361	5.504	2.972	0.003	5.573	27.148
Summation Variance	12.092	1.217	9.933	<0.001	9.927	14.730

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.