Mathematics, 30.11.2019 02:31 assassin42

Afive-year prospective cohort study has just been completed. the study was designed to assess the association between supplemental vitamin a exposure and mortality and morbidity for measles. the rr for incidence of measles was 0.75 and the rr for measles mortality was 0.5.

which statement is correct?

a. a cohort study is not an appropriate study design in this case because the
association between one exposure and two different outcomes is being
considered.

b. one of the problems that this study may have faced is individuals lost to
follow-up during the five-year period.

c. a cohort study is not a good design to study this association because measles is a very common disease.

regarding the rr reported above, which statement is correct?

a. exposure to vitamin a appears to protect against morbidity and mortality
for measles.

b. exposure to vitamin a appears to be a risk factor for morbidity and mortality for measles.

c. exposure to vitamin a is not associated with morbidity and mortality for measles.

d. exposure to vitamin a is a risk factor for morbidity and a protective factor for mortality for measles.

Answers: 1

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 20:30, cld3331

Merrida uses a pattern in the multiplication table below to find ratios that are equivalent to 7: 9. if merrida multiplies the first term, 7, by a factor of 6, what should she do to find the other term for the equivalent ratio? multiply 9 by 1. multiply 9 by 6. multiply 9 by 7. multiply 9 by 9.

Answers: 1

continue

Mathematics, 21.06.2019 20:30, elenaabad18

Ateacher brought a pack of 17 batteries . each calculator uses 3 batteries . how many calculator can the teacher fill with batteries

Answers: 2

continue

Mathematics, 22.06.2019 01:10, andrejr0330jr

Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. here are data on the "penetrability" of the same type of soil at two levels of compression. penetrability is a measure of how much resistance plant roots will meet when they try to grow through the soil. compressed soil 2.85 2.66 3 2.82 2.76 2.81 2.78 3.08 2.94 2.86 3.08 2.82 2.78 2.98 3.00 2.78 2.96 2.90 3.18 3.16 intermediate soil 3.17 3.37 3.1 3.40 3.38 3.14 3.18 3.26 2.96 3.02 3.54 3.36 3.18 3.12 3.86 2.92 3.46 3.44 3.62 4.26 use the data, omitting the high outlier, to give a 95% confidence interval for the decrease in penetrability of compressed soil relative to intermediate soil. compute degrees of freedom using the conservative method. interval: to

Answers: 1

continue

Mathematics, 22.06.2019 01:40, babyphoraaaaa

Over the last 4 seconds, a snail has traveled 4/9 of an inch. if the snail traveled the same distance each second, how far did it travel each second?

Answers: 2

continue

You know the right answer?

Afive-year prospective cohort study has just been completed. the study was designed to assess the as...