Table 1.

Study Procedures for screening, enrollment, and study visits for the diet, chronic kidney disease and apolipoprotein L1 (APOL1) study

Study visit	Study tasks	Duration
Screening/baseline visit	1. Description of study and what the study entails	60 min
	2. Sign additional consent forms
	3. Train on 24h urine collection
	4. Train on completing 24h dietary forms
	5. Participants receive the 24h collection containers
	6. Determine date of 24h urine collection
	7. Inform family members if present to remind of urine collection day
	8. Coordinator provides signs and pins to remind participants of date of 24h urine collection
	9. The day before the 24h urine collection, coordinator calls participants to remind about the urine collection
Study visit 1	1. Return of 24h urine	90–120 min
	2. In-depth dietary interview for 24h dietary recalls using the forms given to participants
	3. Blood draw for serum creatinine measurement and plasma for future studies
	4. Measure of height, weight, and blood pressure
	5. Schedule time for next 24h urine collection and provide materials for next visit
Study visits 2 and 3	1. Return of second 24h urine specimen	90–120 min
	2. In-depth 24h dietary recall interview administered by study coordinator/research nurse
	3. Blood draw for serum creatinine
	4. . Measure of height, weight, and blood pressure
	5. Schedule time for the next 24h urine collection and provide materials for next visit
Annual follow-up visit	1. Update contact information
	2. CRFs on physical activity
	3. Measure of height, weight, and blood pressure
	4. Blood draw for serum creatinine measurement and plasma for future studies

CRF, case report form.