LEEP in the Family Practice Setting

David J. Lyman; Brent Morris

doi:10.3122/jabfm.16.3.204

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Table 1.
Recurrence of Dysplasia Relative to Margin Result.
Margin Result No Recurrence % (No.) Mild Recurrence % (No.) Severe Recurrence % (No.)
Positive margin 75.0 (18/24) 0 25.0 (6/24)
Negative margin 84.8 (39/46) 15.2 (7/46) 0
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Table 2.
Contingency Table for No Recurrences.
Margins Yes Number No Number Total Number
Negative 39 (37.46)^* 7 (8.54) 46
Positive 18 (19.54) 6 (4.46) 24
Total 57 13 70
* Numbers in parentheses are calculated.
Note: The observed χ² = 0.99. If there were an effect at the P = .25 level, then the expected χ² = 1.32; and at the P = .05 level, the expected χ² = 3.841. Because the observed does not exceed the expected, the type of margin does not affect the frequency of no recurrence (P > .25). Accept the null hypothesis that the frequencies are the same.
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Table 3.
Contingency Table for Mild Recurrences.
Margins Yes Number No Number Total Number
Negative 7 (4.6)^* 39 (41.4) 46
Positive 0 (2.4) 24 (21.6) 24
Total 7 63 70
* Numbers in parentheses are calculated.
Note: The observed χ² = 4.06. If there were an effect at the P = .05 level, then the expected χ² = 3.84. Because the observed exceeds the expected, we conclude that the margin type affects the frequency of mild recurrence (P = .05). Reject the null hypothesis that the frequencies are the same.
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Table 4.
Contingency Table for Severe Recurrences.
Margins Yes Number No Number Total Number
Negative 0 (3.94)^* 46 (41.4) 46
Positive 6 (2.06) 18 (21.94) 24
Total 6 64 70
* Numbers in parentheses are calculated.
Note: The observed χ² = 12.38. If there were an effect at the P = .005 level, then the expected χ² = 7.88. Because the observed exceeds the expected, we conclude the margin type affects the frequency of severe recurrence (P = .005). Reject the null hypothesis that the frequencies are the same