Developmental Projects and Special Studies

Attachment 14

Special Study/Pretests

Form Approved OMB No. 0920-0950 Exp. Date xx/xx/20xx

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Up to 3,500 additional persons might participate in tests of procedures or special studies if budgeted. The average burden for these special study/pretest respondents is 3 hours. This may include cognitive testing of questions proposed for inclusion in NHANES. This would be done to make sure that wording of proposed questions are clear and understandable to potential respondents. Another example would be testing an examination procedure to see if it could be done in a small enough space and fast enough time frame, to make if feasible to do in the NHANES Mobile Examination Center (MEC). Special Studies could also include projects like the 24-hour urine calibration study. This proposed study was designed to evaluate the correlation of urinary sodium excretions between NHANES timed urine and 24-hour urine collections. The major objectives of the calibration study were as follows:

• To assess how well the sodium excretion estimated from an NHANES timed urine correlates with data from a 24-hour urine collection.

• To assess the correlation of 24-hour sodium excretion with different NHANES timed urines collected at varying times of day

• To develop calibration equations to estimate 24-hour urine sodium excretion using data from NHANES timed urine samples

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