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Intra‐ and interobserver repeatability of femur length measurement in early pregnancy
Author(s) -
Rosati P.,
Bartolozzi F.,
Guariglia L.
Publication year - 2004
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1002/uog.958
Subject(s) - medicine , repeatability , femur , pregnancy , obstetrics , surgery , statistics , mathematics , biology , genetics
Objective To assess the intra‐ and interobserver reproducibility of songographic measurement of fetal femur length between 10 and 16 weeks of gestation. Methods Femur length was measured three times by the same trained observer in each fetus of 136 pregnant women. A second trained observer then repeated the measurements. The coefficient of variation, intraclass correlation coefficient and repeatability coefficient with 95% CIs were calculated for each observer and between the two observers. Results The inter‐ and intraobserver repeatabilities of femur length were good. For interobserver correlation, the coefficient of variation was 4.6% (95% CI, 3.0–6.2), the intraclass correlation coefficient was 0.82 (95% CI, 0.69–0.95) and the repeatability coefficient was 2.1 (95% CI, 1.8–2.7). For intraobserver correlation, the coefficient of variation was 4.2% (95% CI, 3.2–5.6), the intraclass correlation coefficient was 0.91 (95% CI, 0.75–0.97) and the repeatability coefficient was 3.23 (95% CI, 2.33–3.86) for Observer 2. Similar results were obtained for the other observer. Conclusion Transvaginal femur length measurement is technically feasible and easy to perform between 10 and 16 weeks of gestation. The high degree of intra‐ and interobserver repeatability indicates it to be a reproducible method. Copyright © 2004 ISUOG. Published by John Wiley & Sons, Ltd.