Table 3.

Logistic regression analysis with demographic, obstetric/pregnancy parameters as independent variables, and gestational diabetes as a dependent outcome.

Independent variablesa	Dependent Outcome (GDM)
	aOR (95% CI)	P
Age (whole range)	1.06 (1.04–1.09)	<0.001
Age >30 years	1.93 (1.46–2.56)	<0.001
BMI (whole range)	1.07 (1.04–1.09)	<0.001
BMI ≥30 kg/m2	2.03 (1.46–2.81)	<0.001
Background (other than Caucasian)	1.46 (1.03–2.06)	0.034
Tobacco use	0.90 (0.60–1.34)	0.593
Ferritin levels	1.00 (0.99–1.01)	0.328
Iron deficiency (<15 µg/L)	0.81 (0.60–1.07)	0.140
Parity (whole range)	0.95 (0.84–1.08)	0.437
High parity (>2)	1.26 (0.94–1.68)	0.122
Fetal gender (female)	1.13 (0.86–1.47)	0.384
TSH (all normal) range	1.07 (0.89–1.28)	0.497
TSH >2.50 mIU/L	1.00 (0.62–1.60)	0.990
FT4 (all normal range)	1.00 (0.92–1.09)	0.959
TPOAb whole range	1.00 (0.99–1.00)	0.811
TAIb	1.58 (0.94–2.66)	0.084
TAIc	1.68 (1.01–2.78)	0.048

^aGiven as continuous or categorical values; ^bAge and BMI included as continuous variables; ^cAge and BMI included as categorical variables older age and obesity.

aOR, adjusted odds ratio; GDM, gestational diabetes mellitus; POAb, thyroid peroxidase antibodies; TAI, thyroid autoimmunity (TPOAb ≥60 kIU/L).

Bold indicates statistical significance.