TABLE 4.

Unadjusted and multivariable-adjusted RH (95% CI) for diabetes among interim birth groups by GDM status and stratified by baseline parity groups

Interim birth groups stratified by baseline parity groups	n	Unadjusted	Model 1	Model 2	Model 3	Model 4 (fully adjusted)	Model 4 + physical activity change(mediator)	Model 4 + weight change (mediator)	Model 4 + waist girth change (mediator)
Nulliparous at baseline
0 births (referent)	737	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
≥1 birth without GDM	720	0.7 (0.5–1.1)	0.7 (0.5–1.1)	0.7 (0.5–1.1)	0.9 (0.6–1.3)	0.9 (0.6–1.4)	0.8 (0.5–1.3)	0.8 (0.5–1.3)	0.8 (0.5–1.2)
≥1 birth with GDM	96	3.7 (2.2–6.4)	3.1 (1.8–5.4)	3.0 (1.8–5.2)	3.5 (2.0–6.0)	3.8 (2.2–6.6)	3.7 (2.1–6.4)	3.8 (2.2–6.6)	3.4 (2.0–6.0)
Parous at baseline
0 or ≥1 birth without GDM	778	1.4 (1.0–1.9)	1.2 (0.9–1.8)	1.2 (0.9–1.8)	0.9 (0.6–1.3)	0.8 (0.5–1.2)	0.8 (0.5–1.1)	0.8 (0.5–1.1)	0.8 (0.5–1.1)
0 or ≥1 birth with GDM	77	4.8 (2.9–8.2)	3.7 (2.2–6.3)	3.5 (2.0–5.9)	3.2 (1.9–5.5)	2.9 (1.7–5.0)	2.7 (1.5–4.7)	2.7 (1.6–4.7)	2.6 (1.5–4.5)

Model 1 is adjusted for family history of diabetes; model 2 for family history of diabetes plus baseline FPG; model 3 for all of the above plus baseline BMI, age, and race; and model 4 (fully adjusted) for all of the above plus baseline covariates (education, smoking, and physical activity).