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Calculated pre-test and post-test probability using two studies (Jackson et al., 1989; Stevens, 1987) adopted by Graham (2008) as stringent and lax criteria. Using the lax criterion, a patient with the pre-test probability of 0.85 will keep the post-test probability of 0.93 if NCS is abnormal, but the post-test probability will decline to 0.42 if NCS is normal. The results exactly agree with Fig. 1 in Graham (2008) using the stringent criterion.
