Prevalence of hypertensive retinopathy and its associated factors among adult hypertensive patients attending at Comprehensive Specialized Hospitals in Northwest Ethiopia, 2024, a multicenter cross-sectional study

Table 1 Sample size determination for objective two by considering the family history of hypertension, uncontrolled blood pressure and treatment of HTN as the factor of hypertensive retinopathy

Variable		Hypertensive retinopathy					Power and confidence level	Sample size
Variable		Yes	No	Crude odds ratio	Ratio of unexposed to exposed	Percentage of outcome in the unexposed group	Power and confidence level	Sample size
Family history of hypertension	Yes	79	67	1.75	0.74	54.1%	80% power 95% confidence level	442
Family history of hypertension	No	33	49	1.75	0.74	54.1%
Uncontrolled blood pressure	Yes	17	51	0.117	2.96	74%
Uncontrolled blood pressure	No	20	7	0.117	2.96	74%		50
Treatment of hypertension	Yes	23	49	0.300	1.9	60.9%		116
Treatment of hypertension	No	14	9	0.300	1.9	60.9%		116

ISSN: 2056-9920