Study Design
Data for this analysis came from the New York City Community Health Survey (CHS) Heart Follow-Up Study (HFUS), a cross-sectional study conducted in 2010 to assess population-based sodium intake from a representative sample of New York City adults. Details of the study can be found in the comprehensive methodology report.15 Study participants were recruited from the CHS, an annual telephone survey conducted by the New York City Health Department that includes 8,000 to 10,000 adult New Yorkers.16 To obtain a representative sample of noninstitutionalized adult New Yorkers, the CHS uses a dual frame sample design consisting of random-digit-dial landline telephone exchanges and a second frame of cellular telephone exchanges that cover New York City. The CHS also incorporates a disproportionate stratified random sample design to allow for analysis at the city, borough, and neighborhood levels. Upon completion of the CHS interview, respondents were asked three questions to determine eligibility for HFUS participation: whether they were pregnant (if female), whether they were breastfeeding or lactating (if female), and whether they were currently receiving or had received kidney dialysis during the past 12 months. Any respondents who answered “yes” to any of the three questions were ineligible for HFUS participation. Eligible CHS survey respondents were given detailed explanations of the HFUS and invited to participate. Study participants answered survey questions, collected urine for a 24-hour period, and had a home visit scheduled. During the home visit, a medical technician was required to follow a welcome script.17 The protocol included checking the identification of the person to verify he or she was the intended study participant and asking for the informed consent form. The visit did not continue if consent forms were not signed. The technician then took anthropometric measurements (height and weight), and seated blood pressure according to a standardized study protocol,15 aliquotted the urine, and sent it directly to the research laboratory. Sodium measures were linked to participant survey responses. The Institutional Review Board of the NYC Health Department approved this study.
ศึกษาออกแบบData for this analysis came from the New York City Community Health Survey (CHS) Heart Follow-Up Study (HFUS), a cross-sectional study conducted in 2010 to assess population-based sodium intake from a representative sample of New York City adults. Details of the study can be found in the comprehensive methodology report.15 Study participants were recruited from the CHS, an annual telephone survey conducted by the New York City Health Department that includes 8,000 to 10,000 adult New Yorkers.16 To obtain a representative sample of noninstitutionalized adult New Yorkers, the CHS uses a dual frame sample design consisting of random-digit-dial landline telephone exchanges and a second frame of cellular telephone exchanges that cover New York City. The CHS also incorporates a disproportionate stratified random sample design to allow for analysis at the city, borough, and neighborhood levels. Upon completion of the CHS interview, respondents were asked three questions to determine eligibility for HFUS participation: whether they were pregnant (if female), whether they were breastfeeding or lactating (if female), and whether they were currently receiving or had received kidney dialysis during the past 12 months. Any respondents who answered “yes” to any of the three questions were ineligible for HFUS participation. Eligible CHS survey respondents were given detailed explanations of the HFUS and invited to participate. Study participants answered survey questions, collected urine for a 24-hour period, and had a home visit scheduled. During the home visit, a medical technician was required to follow a welcome script.17 The protocol included checking the identification of the person to verify he or she was the intended study participant and asking for the informed consent form. The visit did not continue if consent forms were not signed. The technician then took anthropometric measurements (height and weight), and seated blood pressure according to a standardized study protocol,15 aliquotted the urine, and sent it directly to the research laboratory. Sodium measures were linked to participant survey responses. The Institutional Review Board of the NYC Health Department approved this study.
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