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Please use the table in Part 4. Dietrich et. al. evaluated the association between vitamin D levels and periodontal attachment loss.

INSTRUCTIONS TO CANDIDATES
ANSWER ALL QUESTIONS

Below is an interpretation of the correlation coefficient for of waist-to-hip ratio in men and HDL2, identify what component of the interpretation is missing

 

 

There is a weak but significantly linear correlation (r=-0.37; p<0.01) between waist-to-hip ratio and HDL2  among men in this study.

 

 

Reference: Ostlund et al, (1990). Predictors of HDL2 cholesterol level. NEJM 322(4):229-234.

 

A. Linear

B. direction

C. magnitude

D. statistical significance

1 points   

QUESTION 2

Please identify the four components necessary in the interpretation of a correlation coefficient. SELECT ALL

alpha level

magnitude

null hypothesis

direction

linear

statistical significance

continuous

1 points   

QUESTION 3

Please use the table in Part 4. Dietrich et. al. evaluated the association between vitamin D levels and periodontal attachment loss. They used tests we have covered to provide descriptive crude comparisons of their study population based on key characteristics. In the attached table. Please indicated which type of statistical test was used for each comparison.

 

         -           A.           B.           C.           D.      , Male age group and race/ethnicity

         -           A.           B.           C.           D.      , Male age group and periodontal attachment loss

         -           A.           B.           C.           D.      , Male age group and BMI

         -           A.           B.           C.           D.      , Male age group and diabetes

         -           A.           B.           C.           D.      , Male age group and ever used estrogen (what test could have been used)

         -           A.           B.           C.           D.      , Male age group and percentage of sites bleeding

         -           A.           B.           C.           D.      , Male age group and dietary calcium intake

         -           A.           B.           C.           D.      , Male age group and serum 25(OH)D3 [vitamin D]

 

A., two sample t-test

B., chi-square test

C., paired t-test

D., ANOVA

 

4 points   

QUESTION 4

Use the table provided in Part 5. Based on the data provided, what statistical test do you think was used to compare the median time from onset of symptoms to categories of age at diagnosis among patients with Crohn's disease.

A. Two sample t-test

B. Kruskal Wallis test

C. Chi-square test

D. ANOVA

E. Wilcoxon rank sum test

2 points   

QUESTION 5

Using the table in Part 5. Please interpret the findings for median time from onset of symptoms to diagnosis and age at diagnosis. 

A. Based on a p-value=0.005, the median time from the onset of symptoms to diagnosis, varied significantly across categories of age. A post-test is needed to determine specifically which categories varied from the others.

B. Based on a p-value=0.005, the median time from the onset of symptoms to diagnosis was not significantly different across categories of age at diagnosis.  

C. Based on a p-value=0.005, the median time from the onset of symptoms to diagnosis was significantly lower among those aged >60 years compared to all other age groups. 

D. Based on a p-value=0.005, the median time from the onset of symptoms to diagnosis was not significantly lower among those aged >60 years compared to all other age groups.

 

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