Table 4.
Interlaboratory comparison of the concentration of same carbonyl compounds analyzed at author's laboratory (Yeungnam University, YNU) and another laboratory (Suncheon College, SCC).
| Compounds | Sample number | MDP(1) (%) | MRE I(2) (%) | MRE II(3) (%) | R (4) | t-test (P value) | Paired t-test (P value) |
|---|---|---|---|---|---|---|---|
| Formaldehyde | 90 | 27.8 | 23.9 | 37.8 | 0.94∗(5) | 0.2 | 0 |
| Acetaldehyde | 90 | 18.5 | 15.3 | 25.6 | 0.97∗ | 0.46 | 0 |
(1)MDP (mean duplicate precision, %) = (1/n)∑n=1 n(|YNU − SCC|/Mean) × 100 (%).
(2)MRE I (mean relative error, %) = (1/n)∑n=1 n(|YNU − SCC|/YNU) × 100 (%).
(3)MRE II (mean relative error, %) = (1/n)∑n=1 n(|YNU − SCC|/SCC) × 100 (%).
(4) R: correlation coefficient.
(5)∗Correlation coefficients are significant at a level of 0.05.