Table 2.

Incidence rates and hazard ratios for hypertension and type 2 diabetes in women with and without a history of preterm delivery

Outcome	Hypertension		Type 2 diabetes mellitus
	Preterm delivery	Term delivery	Preterm delivery	Term delivery
Population, n	3247	12 154	3274	12 327
Events, n (%)	73 (2.2)	194 (1.6)	35 (1.1)	79 (0.6)
Person-years	20 124	74 653	20 565	76 735
Follow-up, median (IQR), y	5.44 (2.28–9.27)	5.01 (2.13–9.62)	5.50 (2.33–9.43)	5.10 (2.16–9.74)
Crude incidence rate per 10 000 person-years	36	25	17	10
Crude HR (95%CI, p value)		1.42 (1.09 to 1.86, 0.011)	1.67 (1.12 to 2.48, 0.012)
Adjusted HR (95%CI, p value)	Model 1*	1.30 (0.99 to 1.70, 0.060)	1.35 (0.90 to 2.02, 0.144)
	Model 2†	1.18 (0.90 to 1.56, 0.236)	1.10 (0.72 to 1.68, 0.670)

*Model 1: adjusted for age, ethnicity, BMI, smoking status.

†Model 2: adjusted for model 1 variables plus lipid-lowering medication prescription, cardiovascular disease, migraine, sexually transmitted diseases, polycystic ovarian syndrome, chronic inflammatory diseases, reproductive tumour, hypertension for T2DM outcome, and T2DM for hypertension outcome.

BMI, Body Mass Index; T2DM, type 2 diabetes mellitus.