Included in meta analysis


Eckfeldt J,Chambless Ll and Shen Y, 1994, Arch Pathol Lab Med, 118, 496-500 , Short-term, within-person variability in clinical chemistry test results


Total Score


Parameter Score
1. Scale A
2. Study Population A
3. Samples A
4. Measurand A
5. Pre-Analytical A
6. Replicate Analysis A
7. Steady State A
8. Outlier Analysis B
9. Normality B
10. Variance Homogeneity A
12. CI A
13. No of Results C
14. Concentrations A
15. Total Score C13

Item Details

Parameter Score
Matrix Serum
Measurand Urea
Unit mmol / ug
Overall Analytical Principle Method Enzymatic analysis - Not specified
Number of Subjects 40
Number of Subjects included in BV estimation 40
Ethinicity Unknown
Age Mean / Median
Age Min 45.0
Age Max 64.0
Age SD
Number of Males
Number of Females
State of Well Being
Healthy (excl pregnant)
Study Duration Length 1
Study Duration Units Month
Sampling Intervals, e.g. X sample(s) per Interval Unit 2
Interval Units Month
Sampling Times Start Time: unknown
End Time: unknown
Number of Samples 3
Average Number of Samples Used for BV Estimation 3.0
Average Number of Replicates 2.0
Estimates of CVi 9.5
Calculated Confidence Intervals of CVi Lower: 8.04, Upper: 11.44
Estimates of CVg 20.8
Calculated Confidence Intervals of CVg Lower: 16.73, Upper: 27.01
Analytical CV 4.8
Calculated Confidence Intervals of Analytical CV Lower: 4.26, Upper: 5.49
Measurand Mean 5.4
Measurand Min
Measurand Max
Measurand SD