Table 1.

Characteristics of the study cohort by pregestational diabetes status: Kaiser Permanente Northern California 1996–2014.

	Pregnancies without recognized pregestational diabetes (N=650,206)	Pregnancies with pregestational type 1 diabetes (N= 1,250)	Pregnancies with pregestational type 2 diabetes (N= 3,972)
	n (%)	n (%)	n (%)
Age, years
<20 years	37,138 (5.7%)	51 (4.1%)	39 (1.0%)
20–29 years	282,628 (43.5%)	518 (41.4%)	900 (22.7%)
30–39 years	300,207 (46.2%)	620 (49.6%)	2,550 (64.2%)
40+ years	26,116 (4%)	58 (4.6%)	469 (11.8%)
Missing	4,117 (0.6%)	3 (0.2%)	14 (0.3%)
Race-Ethnicity
Non-Hispanic White	262,362 (40.4%)	716 (57.3%)	973 (24.5%)
African American	46,190 (7.1%)	119 (9.5%)	413 (10.4%)
Asian	121,906 (18.7%)	109 (8.7%)	915 (23.0%)
Hispanic	159,007 (24.5%)	241 (19.3%)	1,377 (34.7%)
Other	47,223 (7.3%)	53 (4.2%)	248 (6.2%)
Missing	13,518 (2.1%)	12 (1.0%)	46 (1.2%)