MPH 604 Week 7 Assignment Measures of Effect
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1. Table. Varicella and Vaccination
| Varicella |
| |
Vaccinated | Yes | No | Total |
Yes | 15 | 100 | 115 |
No | 18 | 9 | 27 |
Total | 33 | 109 | 142 |
Calculate and interpret the Rate Ratio, Etiologic Fraction, and Population Etiologic Fraction.
2. Table 1. Race and 5-Year Survival Among Prostate Cancer Patients
| 5-Year Survival |
| |
Race | Yes | No | Total |
White | 2,337 | 3,669 | 6,006 |
Black | 344 | 782 | 1,126 |
Calculate and interpret the Relative Risk.
Now consider the same data stratified by 5-year age groups.
Table 2. Race and 5-Year Survival among Prostate Cancer Patients, Aged 70-74 and 75-79
| 5-Year Survival |
| |
| Yes | No | Total |
Ages 70-74 |
|
|
|
White | 1,478 | 1,836 | 3,314 |
Black | 236 | 420 | 656 |
Ages 75-79 |
|
|
|
White | 856 | 1,836 | 2,692 |
Black | 107 | 363 | 470 |
Calculate and interpret the stratified Risk Ratios. Is the relationship confounded by age? Explain.
3. Consider the following data on the relationship between seat belt use and emergency room visits.
| Emergency Room Visit | |
Seat Belt Use | Yes | No |
Males |
|
|
Yes | 23,110 | 288,082 |
No | 6,211 | 18,851 |
Females |
|
|
Yes | 30,837 | 200,337 |
No | 6,030 | 10,304 |
Does gender confound the relationship between seat belt use and emergency room visits? Calculate and interpret ALL the relevant measures of association to support your conclusion.
Male sample space: 336,255
Female sample space: 247,508
| Emergency Room Visit | ||
Seat Belt Use | Yes | No |
Males | ||
Yes | 6.8% | 85% |
No | 1.8% | 5.6% |
Females | ||
Yes | 12.4% | 80.9% |
No | 2.4% | 4.1% |
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