Questions 2-5: You are interested in comparing the incidence density rate of skin cancer in your study population (A) to another study population (B), but you are concerned that the population structures differ by age. You would like to calculate the age-adjusted rate ratio comparing population A to population B. Table 1 describes the number of incident cases of skin cancer over one year in your study populations: (A) and (B). Table 2 reports the number of people in each age group of the population in the nation of Solaria which you will use as the standard population.

Table 1	Population A	Population B
Age group	Number of people in stratum	Number of new cases of skin cancer	Number of people in stratum	Number of new cases of skin cancer
25-34	90,000	4	100,000	8
35-44	120,000	8	65,000	12
45-54	170,000	35	105,000	43
55-64	105,000	28	175,000	67
65-74	75,000	21	210,000	145

Referring to Table 2, please calculate the expected number of cases within each age strata and the total expected cases in population A if its age-specific rates had the same age distribution as the standard population (Solaria) (For rates, round your values to the 100th decimal place; for cases, round your values to the nearest whole numbers)

Table 2	Solaria population
Age group	Number of people in stratum	Age-specific rate in population A (per 100,000/yr)	Expected number of cases in population A	Age-specific rate in population B (per 100,000/yr)	Expected number of cases in population B
25-34	48,000,000	4.44	2,133	8.00	3,840
35-44	43,000,000	6.67	2,867	18.46	7,938
45-54	46,000,000	Question 2	9,470	40.95	18,838
55-64	35,000,000	26.67	9,333	38.29	13,400
65-74	21,000,000	28.00	Question 3	69.05	14,500
Total	193,000,000		29,683		Question 4
Standardized rate per 100,000			??		30.32

• Referring to Table 2 above, what is the age-specific rate in 45-54 years old individuals(per 100,000/yr) in population A ? Report your answer rounded to the 100th decimal place.

• Question 3: Referring to Table 2 above, what is the expected number of cases in 65-74 years old individuals in Population A? Report your answer as an integer.

• Referring to Table 2 above, what is the total expected number of cases in Population B? Report your answer as an integer.

• What method of standardization have you just implemented in Questions 2-4? Group of answer choices

Direct standardization

Indirect standardization

• What is the age-adjusted rate ratio comparing Population A to Population B? Report your answer rounded to the 100th decimal place.

HINT: Use Table 2 to calculate the age-adjusted rate in Population A.