Table 4.

Contingency Table for Severe Recurrences.

MarginsYes NumberNo NumberTotal Number
Negative0 (3.94)*46 (41.4)46
Positive6 (2.06)18 (21.94)24
Total66470
• * 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