Comparison of different statistical approaches used to evaluate the performance of participants in a proficiency testing program
Rev. Inst. Adolfo Lutz (Online)
;
73(1): 26-31, jan.-mar. 2014. graf
Article
in English
| LILACS, SES-SP
| ID: lil-782583
ABSTRACT
Five statistical approaches were applied for assessing the performance of participants in 19 rounds(2007-2011) of the Proficiency Testing Program for lead in blood determination (PEP-Pbs), conducted by Instituto Adolfo Lutz. The performance evaluation was provided by using the z-score. The following statistical approaches were tested 1 mean and standard deviation, after rejecting outliers; 2 median and normalized inter-quartile range; 3 robust mean and robust standard deviation; 4 robust meanand standard deviation for proficiency assessment of 3 μg/100 mL (for concentrations up to 40 μg/100mL and a standard deviation for proficiency assessment of 7.5 % of the assigned value (for concentrations above 40 μg/100 mL); 5 robust mean and standard deviation for proficiency assessment of 2 μg/100 mL(for concentration up to 40 μg/100 mL) or 5 % of the assigned value (for concentrations above 40 μg/100mL). The approach 4 showed to be the most adequate statistical methodology to assess the performance of participating laboratories in the PEP-Pbs...
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Statistics as Topic
/
Laboratory Proficiency Testing
Limits:
Humans
Language:
English
Journal:
Rev. Inst. Adolfo Lutz (Online)
Year:
2014
Type:
Article
Institution/Affiliation country:
Secretaria da Saúde/BR
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