Table 2.

Odds of gestational diabetes diagnosis by maternal characteristics in logistic regression analysis

Characteristic	Risk of diagnosis of GDM
	Odds ratio	95% CI	P
Maternal age
<25 years	0.33	0.25–0.43	<0.001
25–29 years	0.81	0.68–0.96	0.016
30–34 years	Reference
35–39 years	1.35	1.15–1.58	<0.001
≥40 years	1.69	1.29–2.18	<0.001
Parity
0	Reference
1	0.90	0.76–0.95	<0.001
≥2	0.73	0.61–0.87	0.009
Ethnicity
White European	Reference
Asian	2.33	1.85–2.91	<0.001
Black	1.75	1.26–2.37	<0.001
Other	0.71	0.35–1.25	0.285
Maternal BMI
<18.5 kg/m2	0.45	0.23–0.81	0.015
18.5–24 kg/m2	Reference
25–29 kg/m2	1.47	1.26–1.70	<0.001
30–34 kg/m2	2.20	1.79–2.68	<0.001
35–39 kg/m2	3.61	2.78–4.65	<0.001
≥40 kg/m2	3.92	2.74–5.47	<0.001
Day of delivery (per week)	1.07	1.02–1.13	0.007
Average temperature at 28 weeks (per 5°C)	1.13	1.02–1.25	0.034
Average daily hours of sunshine at 28 weeks	0.99	0.96–1.02	0.440
Average 24‐h rainfall at 28 weeks	1.00	0.97–1.02	0.232
Average daily humidity at 28 weeks	1.01	0.99–1.03	0.451
Average daily maximum wind speed at 28 weeks	0.99	0.98–1.01	0.930
Average daily mean wind speed at 28 weeks	1.00	0.98–1.02	0.902
Average daily dew point at 28 weeks	1.00	0.98–1.02	0.424
Average daily atmospheric pressure at 28 weeks	0.99	0.98–1.01	0.961

GDM, gestational diabetes.