Table 2 Adjusted ORs for HT according to history of HDP

Age group	HDP category	HT+/HT− (n/N)	Prevalence of HT (%)	Adjusted OR (95% CI)	p value
20s	HDP−	0/172	0	NA
20s	HDP+	0/7	0	NA
30s	HDP−	63/1958	3.1	1.00 (Ref)
30s	HDP+	18/94	16.1^a	3.63 (1.94–6.79)	<0.0001
40s	HDP−	358/2473	12.7	1.00 (Ref)
40s	HDP+	53/120	30.6^a	1.84 (1.26–2.70)	0.0018
50s	HDP−	1649/4204	28.2	1.00 (Ref)
50s	HDP+	160/166	49.1^a	2.15 (1.69–2.73)	<0.0001
60s	HDP−	6299/8615	42.2	1.00 (Ref)
60s	HDP+	413/315	56.7^a	1.48 (1.26–1.74)	<0.0001
70s≤	HDP−	3341/2695	55.4	1.00 (Ref)
70s≤	HDP+	170/69	71.1^a	1.86 (1.38–2.50)	<0.0001

Adjusted odds ratios were calculated using age, BMI, family history of hypertension, and alcohol intake for each age group. The adjusted ORs for hypertension in women with a history of HDP tended to be higher in younger age groups, the adjusted OR in 30–50s was 1.88 (1.57–2.26) and that in 60s≤ was 1.51 (1.32–1.74) (p for interaction = 0.057)
HDP hypertensive disorders of pregnancy, HT hypertension, OR odds ratio, 95% CI 95% confidence interval, NA not applicable, Ref reference
^aThe prevalence of HT is significantly higher in the HDP+ group than in the HDP− group in all age groups except for patients in their 20s (p < 0.01). Fisher’s exact test was used for patients in their 30s. The chi-square test was used in the other age groups

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