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Table 4 Inter–observer error. This table shows the two successive measurements of RI by the two observers and its differences. The inter-observer error in terms of 95% CI was calculated using the formula (SD/√2)/2, where SD is this of the differences between the two observers. The inter-observer error was 0.0213.

From: Reliability study for the Rib Index in chest radiographs of a control group

RI :1st observer’s measurement

RI: 2nd observer’s measurement

Difference

1.33

1.34

0.01

1.41

1.41

0

1.41

1.45

0.04

1.79

1.79

0

1.84

1.81

0.03

1.95

1.95

0

1.72

1.72

0

1.3

1.33

0.03

1.71

1.73

0.02

1.66

1.68

0.02