Supplementary Table IX.

ANCOVA pairwise testing of differences in mean number of emergency room visits, adjusted for years of enrolment, in the Optum cohort

Groups	ANCOVA P value
Asian vs Black	<.001†
Asian vs Hispanic	.142
Asian vs White	.332
Black vs Hispanic	.001∗
Black vs White	<.001†
Hispanic vs White	1.000

Group	Adjusted mean	95% confidence interval of adjusted mean
Asian	0.1	−0.1 to 0.3
Black	0.6	0.5 to 0.7
Hispanic	0.4	0.3 to 0.5
White	0.3	0.3 to 0.4

ANCOVA, Analysis of covariance.

^∗P < .01.

^†P < .001.