### Person-Time Rate and 95% Confidence Intervals
Per 100 Person-Time Units
| Number of cases: | 66 |
| Person-Time: | 2098 |
| Lower CL | Rate | Upper CL
Normal approximation | 2.387 | 3.146 | 3.905
Byar approx. Poisson | 2.433 |  | 4.002
Rothman/Greenland | 2.472 |  | 4.004
"Normal approximation" to the Poisson distribution as described by Rosner, Fundamentals of Biostatistics (5th Ed)
"Byar approximation to the Poisson" as described in Rothman and Boice, Epidemiologic Analysis with a Programmable Calculator
"Rothman/Greenland" as described in Rothman and Greenland, Modern Epidemiology (2nd Ed)
Note The Rothman/Greenland results have not been validated against other sources.

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