Question

Please show formulas, I just want to verify that I was doing the work correctly and please show one example of the case rate and ratio of cases, Thank you

1. The population of a state is 2,100,000. In a surveillance project lasting three months, investigators found communicable disease reports documenting one case of anthrax, three cases of mumps, 132 cases of pertussis, 27 cases of tuberculosis, 10 cases of primary and secondary syphilis, and 374 cases of gonorrhea.

Calculate the ratio of cases to population for each disease. Then, calculate the case rate (per 100,000 population per year) for each disease.

Calculate the ratio of cases to population for each disease.

Anthrax- 1 case for 3 months ratio- R=X/Y thus 1/2,586,000

Mumps-    …………………………… ratio- R=X/Y thus 3/2,586,000 reduced to 1/862,000

Calculate the case rate(per 100,000 population per year) for each disease

Anthrax- 1 case per 3 months thus 4 per year ……. [4/2,100,000] * 100,000 = 0.19

Mumps- 3 cases per 3 months thus 12 per year …..[12/2,100,000]* 100,000= 0.57

Answer 1

The number of cases of a particular infection or exposure during a unit of time, divided by the population during that

period; CRs are often expressed in terms of a population of 100,000

The population of a state is 2,100,000. In a surveillance project lasting three months, investigators found communicable disease reports documenting one case of anthrax, three cases of mumps, 132 cases of pertussis, 27 cases of tuberculosis, 10 cases of primary and secondary syphilis, and 374 cases of gonorrhoea.

Anthrax- 1 case per 3 months thus 4 per year

Ratio =[4/2,100,000]

CR = Ratio* 100,000 = 0.190476

Mumps- 3 cases per 3 months thus 12 per year

Ratio = [12/2,100,000]

CR = Ratio* 100,000= 0.57142

Pertusis-132 cases per 3 months thus 528 per year =[528/2,100,000]* 100,000 =25.1428

TB 27 cases per 3 months thus 108 per year = [108/2,100,000]* 100,000 = 5.14285

Syphilis 10 cases per 3 months thus 40 per year =  [40/2,100,000]* 100,000 = 1.90476

Gonorrhoea 374 cases per 3 months thus 1496 per year =  [1496/2,100,000]* 100,000 = 71.23809