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5—RELIABILITY OF PHYSICAL FINDINGS
Observer B:
Observer A:
210
90
20 80 100 20 80 100
Sample problem:
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39
agreement is also less than perfect, with κ-statistics similar to those observed with physical signs. Even with laboratory tests, which present the clinician with a single, indisputable number, interobserver disagreement is still possible and even common, simply because the clinician has to interpret the laboratory test’s significance. For example, in one study of three endocrinologists reviewing the same thyroid function tests and other clinical data of 55 consecutive outpatients with suspected thyroid disease, the endocrinologists disagreed about the final diagnosis 40% of the time.34 Computerized interpretation of test results performs no better: in a study of pairs of electrocardiograms taken only 1 minute apart from 92 patients, the computer interpretation was significantly different 40% of the time, even though the tracings showed no change.
186
By defining abnormal findings precisely, by studying and mastering examination technique, and by observing every detail at the bedside attentively and without bias or distraction, we can minimize interobserver disagreement and make physical diagnosis more precise. It is simply impossible, however, to abstract every detail of clinicians’ observations of patients into exact physi­cal signs, and, in this way, physical diagnosis is no different than any of the other tools we use to categorize disease. So long as both the material and the observers of clinical medicine are human beings, a certain amount of subjectivity always will be with us.
Appendix. Calculation of the κ-statistic
e observations of two observers who are examining the same N patients independently are customarily displayed in a 2 × 2 table, similar to that in Fig. 5.1. Observer A finds the sign to be present in w1 patients and absent in w2 patients; observer B finds the sign to be present in y1
Fig. 5.1 Interobserver agreement and the κ-statistic. Top half: Conventional 2 × 2 table displaying data for calculation of κ-statistic. Bottom half: A sample case, in which observed agreement is 80%, chance agree­ment is 74%, and the κ-statistic is 0.23 (see Appendix for discussion).
Sign +
Sign +
Sign
Observed agreement Chance agreement
15 75
a
c
y
55 10
Sign
b
d
1
90
y
2
w
1
w
2
N
72
40
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2—UNDERSTANDING THE EVIDENCE
patients and absent in y2 patients. e 2 observers agree the sign is present in a patients and absent in d patients. erefore, the observed agreement (PO) is:
PO = (a + d)/N
Calculation of the κ-statistic first requires calculation of the agreement that would have occurred by chance alone. Among all the patients, observer A found the fraction w1/N to have the sign; therefore, by chance alone, among the y1 patients with the sign according to observer B, observer A would find the sign in (w1/N) times y1 or (w1y1/N) patients (i.e., this is the number of patients in which both observers agree the sign is present, by chance alone). Similarly, both observers would agree the sign is absent by chance alone in (w2y2/N) patients. erefore, the expected chance agree­ment (PE) is their sum, divided by N:
()wy wy
+
PE=
11 22
2
N
is equation shows that agreement by chance alone (PE) approaches 100% as both w1 and y1 approach 0 or N (i.e., both clinicians agree that a finding is rare or that it is very common).
e κ-statistic is the increment in observed agreement beyond that expected by chance (PO–PE),
divided by the maximal increment that could have been observed had the observed agreement been perfect (1–PE):
(1Po P
)
κ =
E
P
()
E
For example, Fig. 5.1 depicts the observations of two observers in a study of 100 patients with dyspnea. Both agree the third heart sound is present in 5 patients and absent in 75 patients; there­fore, simple agreement is (5 + 75)/100 or 0.80. By chance alone, they would have agreed about the sound being present in (10 × 20)/100 patients (i.e., 2 patients) and absent in (90 × 80)/100 patients (i.e., 72 patients); therefore, chance agreement is (2 + 72)/100 patients or 0.74. e κ-statistic for this finding becomes (0.80–0.74)/(1–0.74) = (0.06)/(0.26) = 0.23.
References may be accessed online at Elsevier eBooks for Practicing Clinicians.
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