Table 2.

Comparison of mean prime diet quality score during and before pregnancy

	During pregnancy		Before pregnancy		Mean difference		95% Confidence interval
Dietary Quality	Mean	SD	Mean	SD	Mean	SD	Lower-upper limit	p-value
Overall PDQS	18.34	3.36	21.63	3.62	–3.28	4.73	(–3.70; –2.87)	<0.0001
Women without GDM	18.39	3.55	22.23	3.56	–3.84	4.80	(–4.73; –2.92)	<0.0001
Women diagnosed with GDM	18.32	3.37	21.45	3.61	–3.12	4.73	(–3.59; –2.66)	<0.0001
Overall, the unhealthy food group score	6.99	2.08	5.61	2.12	1.38	2.65	(1.15; 1.61)	<0.0001
Women without GDM	7.04	2.10	5.61	2.16	1.44	2.75	(1.17; 1.71)	<0.0001
Women diagnosed with GDM	6.80	1.99	5.61	1.98	1.18	2.39	(0.74; 1.63)	<0.0001
Overall, the healthy food group score	11.35	3.32	16.02	3.58	–4.67	3.73	(–4.99; –4.34)	<0.0001
Women without GDM	11.28	3.31	15.82	3.66	–4.57	3.71	(–4.93; –4.20)	<0.0001
Women diagnosed with GDM	11.60	3.40	16.62	3.28	–5.02	3.78	(–5.73; –4.32)	<0.0001

Note: GDM, Gestational diabetes mellitus; PDQS, Prime Diet Quality Score.