Authors:
M. Y. K. Bilgili, S. Bulbul, S. A. Kara, C. Sanli, H. H. Erdal, D. Altinok; Ankara/TR
DOI:
10.1594/ECR03/C-0727
Results
To test intraobserver variability, 10 patients underwent hand and wrist US twice in a period of two weeks. The results were compared with t test and, there was no significant difference (p=0.691). During the first three weeks of the study, average time per patient took 3 minutes and 45( 12) seconds and after this period it took 2 minutes and 12 ( 10) seconds per patient.Estimated bone ages of the two methods (plain radiography and hand and wrist US charts) compared statistically and they were highly correlated. For boys 84,4 % of the time the difference was less then 6 months between the methods. In one patient (2,2%) there was 4, and in seven patients (15,6%) there was 6 months difference. The R2 value was 0,9881 for boys.For girls, 88,5% of the time the age estimated by US was within 6 months of the age estimated by radiography (Table 1, 2). Figure 1: Hand and US chart of a 2 year old girlTable 1. The difference between two methods among boysDifference (month)FrequencyPercent (%)Cumulative Percent (%)03271,171.13511.182.2412.284.46715.6100Sum45100 Table 2. The difference between two methods among girlsDifference (month)FrequencyPercent (%)Cumulative Percent (%)03465.465.4111.967.3211.969.2347.776.96611.588.5823.892.3935.898.11211.9100Sum52100