Please check my calculation and interpretastion for accuracy. If incorrect, plea

Question

Please check my calculation and interpretastion for accuracy. If incorrect, please explain and show steps

An epidemiological study of prostate cancer among elderly men followed 1,400 men, 65-79 years of age, without evidence of prostate cancer over several years. Every two years the investigators examined the men for prostate cancer. The results were as follows: 12 new cases at the first evaluation, 11 new cases at the second evaluation, 23 new cases at the third evaluation, and 28 newcases at the fourth (final) evaluation. The investigators also noted that 35 of the men had withdraw from the study at the third evaluation. Based on this information, calculate and interpret the incidence density rate of prostate cancer in this group. Sum of length of time at risk for each individual in person-time units

Explanation / Answer

The calculation seems to be okay, as denominator is rightly measured as ratio is obtained properly.

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