The following comparison of surgical procedures is taken from Charig et al. (1986). Two treatments are considered
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The following comparison of surgical procedures is taken from Charig et al. (1986). Two treatments are considered for kidney stones, namely open surgery (abbreviated to OS) and percutaneous nephrolithotomy (PN). It is reported that OS has a success rate of 78% (= 273/350) and PN a success rate of 83% (= 289/350). This looks like a marginal advantage to PN. On looking more closely, the patients are divided into two groups depending on whether or not their stones are smaller than 2 cm, with the following success rates.
stone < 2 cm stone > 2 cm Total OS 93% (= 81/87) 73% (= 192/263) 78% (= 273/350)
PN 87% (= 234/270) 68% (= 55/80) 83% (= 289/350)
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Probability An Introduction
ISBN: 9780198709978
2nd Edition
Authors: Geoffrey Grimmett, Dominic Welsh
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