Disease Mortality Rate Tracking Study

CAT 2022 Slot 3 · DILR · Medium · Data Interpretation

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Passage / data set

A study to determine the mortality rate for a disease began in 1980. The study chose 1000 males and 1000 females and followed them for forty years or until they died, whichever came first. The 1000 males chosen in 1980 consisted of 250 each of ages 10 to less than 20, 20 to less than 30, 30 to less than 40, and 40 to less than 50. The 1000 females chosen in 1980 also consisted of 250 each of ages 10 to less than 20, 20 to less than 30, 30 to less than 40, and 40 to less than 50.

The four figures depict the age profile of those among the 2000 individuals who were still alive in 1990, 2000, 2010, and 2020. The blue bars in each figure represent the number of males in each age group at that point in time, while the pink bars represent the number of females in each age group at that point in time. The numbers next to the bars give the exact numbers being represented by the bars. For example, we know that 230 males among those tracked and who were alive in 1990 were aged between 20 and 30.

Question 1 of 5

In 2000, what was the ratio of the number of dead males to dead females among those being tracked?

  1. A.

    109 : 107

  2. B.

    129 : 131

  3. C.

    71 : 69

  4. D.

    41 : 43

Answer

C

Explanation

Total males = 1000, alive males in 2000 = 180 + 205 + 160 + 100 = 645 ⇒\Rightarrow dead males = 355. Total females = 1000, alive females in 2000 = 210 + 175 + 150 + 120 = 655 ⇒\Rightarrow dead females = 345. Ratio = 355:345=71:69355 : 345 = 71 : 69.

Question 2 of 5

How many people who were being tracked and who were between 30 and 40 years of age in 1980 survived until 2010?

  1. A.

    90

  2. B.

    190

  3. C.

    110

  4. D.

    310

Answer

B

Explanation

People aged 30 to 40 in 1980 would be aged 60 to 70 in 2010. Looking at 2010: males aged 60–70 = 90, females aged 60–70 = 100. Total = 90+100=19090 + 100 = 190.

Question 3 of 5

How many individuals who were being tracked and who were less than 30 years of age in 1980 survived until 2020?

  1. A.

    470

  2. B.

    580

  3. C.

    240

  4. D.

    230

Answer

A

Explanation

People aged < 30 in 1980 (10–20 and 20–30) would be aged 50–60 and 60–70 in 2020. Summing the corresponding bars in 2020 gives 140 + 125 + 100 + 105 = 470.

Question 4 of 5

How many of the males who were being tracked and who were between 20 and 30 years of age in 1980 died in the period 2000 to 2010?

Answer

40

Explanation

In 2000, males aged 40–50 (who were 20–30 in 1980) were 205. In 2010, males aged 50–60 were 165. Deaths in this period = 205−165=40205 - 165 = 40.

Question 5 of 5

How many of the females who were being tracked and who were between 20 and 30 years of age in 1980 died between the ages of 50 and 60?

Answer

30

Explanation

Females aged 20–30 in 1980 reach age 50 in 2000 (175 alive) and age 60 in 2010 (145 alive). Deaths = 175−145=30175 - 145 = 30.

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