Table 3. Relative risk of hypertension by age, sex, and family history of hypertension.

Risk Factors	Relative Risk (95% CI for RR)
	Stage 1 HTN	Stage 2 HTN	Hypertension Crisis
Age
18–27 years	1.21 (1.01–1.45)	0.49 (0.26–0.95)	1.28 (0.62–2.62)
28–37 years	1.33 (1.17–1.49)	0.31 (0.17–0.54)	1.35 (0.81–2.27)
38–47 years	0.97 (0.87–1.06)	0.25 (0.19–0.32)	1.68 (1.11–2.51)
≥48 years	0.33 (0.26–0.41)	0.32 (0.17–0.59)	5.92 (4.72–7.42)
Sex
Male	0.82 (0.68–0.98)	1.67 (0.53–2.85)	1.37 (0.93–2.02)
Female	1.13 (1.01–1.26)	1.17 (1.07–1.27)	0.96 (0.92–1.01)
Family History of Hypertension
Yes	0.77 (0.69–0.87)	1.41 (1.12–1.74)	1.51 (1.0.3–2.23)
No	1.44 (1.23–1.69)	0.86 (0.79–0.94)	0.95 (0.91–0.99)

Abbreviations: RR-relative risk, CI-confidence interval, HTN-hypertension. Note: The reference category is the stage of elevated blood pressure.