Vitamin A


Gillespie C, Ballew C, Bowman BA, Donehoo R, Serdula MK, 2004 Apr, Am J Clin Nutr, 79(4), 625-32 , Intraindividual variation in serum retinol concentrations among participants in the third National Health and Nutrition Examination Survey, 1988–1994


Total Score


Parameter Score
1. Scale A
2. Study Population A
3. Samples D
4. Measurand NA
5. Pre-Analytical NA
6. Replicate Analysis NA
7. Steady State NA
8. Outlier Analysis NA
9. Normality NA
10. Variance Homogeneity NA
12. CI NA
13. No of Results NA
14. Concentrations NA
15. Total Score D3
Comment the number of samples was 2 but time of sample collection and length of study period are not present or deducible from the included data

Item Details

Parameter Score
Matrix Serum
Measurand Vitamin A
Unit micromol / L
Overall Analytical Principle Method Chromatography; HPLC
Number of Subjects 2004
Number of Subjects included in BV estimation
Ethinicity Caucasian
Age Mean / Median
Age Min
Age Max
Age SD
Number of Males
Number of Females
State of Well Being
Healthy (excl pregnant)
Study Duration Length
Study Duration Units Week
Sampling Intervals, e.g. X sample(s) per Interval Unit
Interval Units Week
Sampling Times Start Time:
End Time:
Number of Samples
Average Number of Samples Used for BV Estimation
Average Number of Replicates
Estimates of CVi
Calculated Confidence Intervals of CVi Lower: , Upper:
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: , Upper:
Analytical CV
Calculated Confidence Intervals of Analytical CV Lower: , Upper:
Measurand Mean
Measurand Min
Measurand Max
Measurand SD