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Table 2: 
Outcome of repeat examination by interval since the examination with negative findingsa
Interval between CTsNo. of Positive ExaminationsTotal Repeat Examinations% PositiveP Valueb
<30 days53441.5.011
<60 days84911.8.007
<90 days96051.7.002
<120 days106901.6<.001
<180 days118041.5<.001
>180 days2513591.8<.001
  • ↵a Outcome of repeat NCHCT examinations as a function of the interval (in days) since the prior examination with negative findings. The proportion of repeat examinations with positive findings remained between 1.5% and 1.8% (and significantly lower than the 4.3% positive rate of first/baseline examinations) for the durations (up to 1 year) considered in this study.
  • ↵b The P value was taken against the 4.3% rate of first/baseline examinations.