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Inter- and intra-observer variation in the amniotic fluid index
A Peedicayil1, M Mathai, A Regi
1Department of Obstetrics and Gynaecology, C.M.C. Hospital, Vellore, India.
Obstetrics and Gynecology
|November 1, 1994
Summary
This study found good intra-observer agreement for amniotic fluid index (AFI) measurements but only moderate inter-observer agreement. Clinicians should use caution when interpreting AFI values near cutoff points.
Area of Science:
- Obstetrics and Gynecology
- Diagnostic Imaging
- Fetal Medicine
Background:
- The amniotic fluid index (AFI) is a key ultrasound parameter for assessing fetal well-being.
- Variability in AFI measurement can impact clinical decision-making.
Purpose of the Study:
- To evaluate the inter-observer and intra-observer reliability of amniotic fluid index (AFI) measurements.
- To determine the consistency of AFI assessments between different clinicians and by the same clinician over time.
Main Methods:
- Three observers independently measured AFI in 32 patients (inter-observer reliability).
- Each observer repeated measurements on 10 different patients (intra-observer reliability).
- Intra-class correlation coefficients (ICCs) and kappa statistics were used to quantify agreement.
Main Results:
- Intra-observer reliability (ICC > 0.8) was good.
- Inter-observer reliability (ICC = 0.67) was moderate.
- Inter-observer agreement (kappa = 0.44) showed 22-28% disagreement between pairs of observers.
Conclusions:
- AFI measurements demonstrate good consistency when performed by the same observer.
- Moderate agreement between different observers suggests potential variability in clinical practice.
- AFI values near established cutoff thresholds require careful interpretation due to potential measurement discrepancies.