Relationship between gestational body mass index change and the risk of gestational diabetes mellitus: a community-based retrospective study of 41,845 pregnant women

Table 2 Comparison of BMI gain between the GDM and the non-GDM groups

Early pregnancy BMI (kg/m²)	n	BMI gain (kg/m²)		t	P-value
		non-GDM group	GDM group
< 18.50	4080	2.74 (0.91)	2.70 (1.00)	0.592	0.554
18.50–19.99	6203	2.73 (0.95)	2.71 (1.03)	0.370	0.712
20.00–21.99	10,253	2.70 (1.00)	2.69 (1.00)	0.191	0.848
22.00–23.99	8507	2.68 (1.07)	2.65 (1.08)	0.755	0.450
24.00–25.99	5653	2.56 (1.10)	2.58 (1.13)	−0.391	0.696
26.00–27.99	3281	2.33 (1.19)	2.31 (1.11)	0.268	0.789
28.00–29.99	1845	2.15 (1.22)	2.10 (1.08)	0.760	0.447
≥30.00	2023	1.81 (1.29)	1.75 (1.29)	0.819	0.413
F		236.640	46.623
P-value		< 0.001	< 0.001

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