Table 2.

GDM status according to self-reported^a and medical^b data in Growing Up in New Zealand

Self-reported GDM statusa	GDM status according to medical datab		P-value
	Normal glucose tolerance	GDM
No diabetes	6039 (93.7%)	115 (1.7%)	< 0.0005
GDM	61 (0.9%)	226 (3.5%)

Data are presented as number of participants and percentages unless otherwise indicated, missing values have not been included in the column %. Women who were identified as having other forms of diabetes either by self-report or medical data (n = 113) were excluded from this table. Distributions are compared by Pearson chi-square test

GDM gestational diabetes mellitus, n number

^aSelf-reported data from antenatal and postpartum data collection points combined using responses “during this pregnancy only” and “for the first time in the last 14 weeks of pregnancy” as a proxy for GDM

^bMedical data combines data from the District Health Boards, Ministry of Health and laboratories