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The total population of diabetic patients can be obtained by completing the contingency table. Once this has been estimated, prevalence rates can be determined by dividing this by the total population at risk.

Crude rate = 2 585/176 682
= 1.45 (1.41-1.52)
 
Capture-recapture adjusted rate
= 3 738/176 682
= 2.12 (1.97 - 2.21)