Table 2. Distribution of Age at Diabetes Diagnosis by Race and Ethnicity in the United States, 2011-2018.

Variable	Overall (N = 3022)	Non-Hispanic White (n = 946)	Non-Hispanic Black (n = 805)	Mexican American (n = 508)a	Non-Hispanic Asian (n = 339)
Summary measures of age at diabetes diagnosisb
Mean (95% CI)	49.9 (49.2-50.7)	51.8 (50.8-52.9)	47.2 (46.1-48.4)	44.9 (43.4-46.4)	50.5 (48.4-52.6)
P value for differencec	NA	1 [Reference]	<.001	<.001	.25
Median	50	52	48	45	50
P value for differencec,d	NA	1 [Reference]	<.001	<.001	.07
Proportion of adults with diabetes diagnosis at varying agesb
Diagnosis at <40 y, %	19.4	14.4	25.1	35.0	19.3
P value for differencec	NA	1 [Reference]	.001	<.001	.10
Diagnosis at <35 y, %	12.2	9.3	15.5	21.0	13.2
P value for differencec	NA	1 [Reference]	.006	<.001	.10
Diagnosis at <30 y, %	5.9	4.4	7.3	10.1	7.4
P value for differencec	NA	1 [Reference]	.06	.008	.14

Abbreviation: NA, not applicable.

^aOversampled relative to other Hispanic populations owing to the National Health and Nutrition Examination Survey sampling design.

^bAll statistics are weighted to be representative of the US population.

^cP values were calculated using the group with the oldest mean age at diagnosis as the referent (non-Hispanic White adults).

^dBased on quantile regression.