Table 2. Adjusted Relative Rates From the Interrupted Time Series Poisson or Negative Binomial Regression Model Estimating Yearly Number of American Indian/Alaska Native Applicants, Matriculants, and Graduates During 22 Years (1996-2017).

Measure	Adjusted relative rate (95% CI)	P valuea
Applicants
Baseline count in 1996	311.88 (271.86-357.78)	<.001
Trend before the change in race data collection	0.95 (0.91-0.98)	.004
Immediate change after the modification in the survey question	1.78 (1.55-2.06)	<.001
Change in trend after the modification in the survey question	1.10 (1.06-1.14)	<.001
Male sexb	1.01 (0.99-1.02)	.29
Ageb	0.96 (0.85-1.08)	.50
MCAT scoreb	0.86 (0.79-0.93)	<.001
Matriculants
Baseline count in 1996	123.77 (102.91-148.86)	<.001
Trend before the change in race data collection	0.97 (0.92-1.02)	.27
Immediate change after the modification in the survey question	1.62 (1.35-1.95)	<.001
Change in trend after the modification in the survey question	1.04 (0.99-1.09)	.09
Male sexb	1.01 (0.99-1.02)	.50
Ageb	0.97 (0.83-1.13)	.69
MCAT scoreb	0.97 (0.88-1.08)	.59
Graduatesc
Baseline count in 1996	112.15 (91.53-137.42)	<.001
Trend before the change in race data collection	0.98 (0.92-1.03)	.38
Immediate change after the modification in the survey question	1.94 (1.57-2.38)	<.001
Change in trend after the modification in the survey question	1.00 (0.95-1.06)	.92
Male sexb	1.01 (0.99-1.03)	.33
Ageb	1.06 (0.89-1.25)	.51
MCAT scoreb	1.05 (0.91-1.22)	.51

Abbreviation: MCAT, Medical College Admission Test.

^aWald tests.

^bVariables are mean centered.

^cExcludes years 2015 to 2017.