Table 3.

Association between plasma irisin and the risk of gestational diabetes mellitus in pregnant women

Variable	Model 1		Model 2		Model 3
	OR	95% CI	OR	95% CI	OR	95% CI
Overall
Continuous variable	0.968	0.918–1.022	0.967	0.916–1.022	0.977	0.923–1.035
Categories variable
Q1	1.00	Reference	1.00	Reference	1.00	Reference
Q2	0.780	0.462–1.318	0.870	0.510–1.486	0.751	0.432–1.304
Q3	0.471	0.168–1.316	0.476	0.164–1.385	0.406	0.132–1.253
Q4	0.675	0.168–1.316	0.731	0.248–2.149	0.578	0.186–1.799
Statistical analysis
High dietary n‐3 PUFA (n = 466)
Continuous variable	1.004	0.949–1.063	0.995	0.936–1.058	0.990	0.923–1.062
Categories variable
Q1	1.00	Reference	1.00	Reference	1.00	Reference
Q2	0.819	0.409–1.643	0.922	0.451–1.886	0.849	0.409–1.760
Q3	0.483	0.098–2.388	0.403	0.070–2.308	0.373	0.051–2.758
Q4	1.095	0.222–5.395	1.105	0.182–5.654	0.882	0.125–6.222
Low dietary n‐3 PUFA (n = 466)
Continuous variable	1.037	0.959–1.122	1.047	0.966–1.136	1.033	0.948–1.126
Categories variable
Q1	1.00	Reference	1.00	Reference	1.00	Reference
Q2	0.975	0.430–2.21	1.150	0.485–2.723	0.870	0.346–2.188
Q3	0.560	0.120–2.609	0.557	0.119–2.600	0.549	0.113–2.674
Q4	0.761	0.157–3.697	0.824	0.170–3.999	0.723	0.723–3.676

Model 1 was adjusted for survey years, age, gestational age and pre‐pregnancy body mass index. Model 2 was further adjusted for gestational diabetes mellitus in a previous pregnancy, family history of diabetes, physical activities, smoking during pregnancy, alcohol use during pregnancy, dietary energy intake and dietary n‐3 PUFAs intake. Model 3 was further adjusted for occupation, monthly household income and educational level.

CI, confidence interval; OR, odds risk; PUFA, polyunsaturated fatty acid; Q, quartile.