Document Detail

Inter- and intra-observer variation in the amniotic fluid index.
MedLine Citation:
PMID:  7936525     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To measure inter- and intra-observer reliability in the amniotic fluid index (AFI). METHODS: To measure inter-observer reliability, three observers measured the AFI at random in 32 patients without knowing each other's results. To determine intra-observer reliability, each investigator made repeated measurements on ten other patients. Patients at 26-41 weeks' gestation who were referred for an antenatal ultrasound examination were asked to participate. Intra-observer reliability and inter-observer reliability were expressed as intra-class correlation coefficients. Inter-observer agreement was also expressed as the kappa statistic after dichotomizing the AFI (less than 8 cm, 8 cm or more). RESULTS: The intra-class correlation coefficient for intra-observer reliability exceeded 0.8, and for inter-observer reliability it was 0.67 (95% confidence interval [CI] 0.52-0.79), with an overall kappa of 0.44 (95% CI 0.22-0.65). The percentage disagreement between pairs of observers reached 22-28%. CONCLUSION: Measurements of AFI have good intra-observer and moderate inter-observer agreement. In clinical use, an AFI level near a cutoff value should be interpreted with caution.
A Peedicayil; M Mathai; A Regi; L Aseelan; K Rekha; P Jasper
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  84     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1994 Nov 
Date Detail:
Created Date:  1994-11-16     Completed Date:  1994-11-16     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  848-51     Citation Subset:  AIM; IM    
Department of Obstetrics and Gynaecology, C.M.C. Hospital, Vellore, India.
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MeSH Terms
Amniotic Fluid / ultrasonography*
Gestational Age
Observer Variation
Ultrasonography, Prenatal*

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