Table 1.

Characteristics of the TrialNet cohort at time of initial Ab screen

Characteristic	Ab (−) at initial screening	Ab (+) at initial screening	P value
Total (n)	31,038	1,807
Age at initial screen (median [Q1–Q3])	9.2 (5.4–12.8)	9.1 (6.0–12.4)	0.5511
Sex (% female)	50	49	0.1985
Race/ethnicity (%)			<0.0001
White	72	75
Hispanic	16	11
Black	2	3
Other	3	3
Unknown	7	8
Relationship to index patient with type 1  diabetes (%)			<0.0001
Sibling	56	64
Offspring	23	23
Other relative	21	13