Consider the following study:Healthy individuals are assessed according to their current body mass index (BMI). Two years later, their health status is reassessed, and the relationships with their earlier BMI were determined.What is the type of epidemiological study described above?
In a double blind trial of a new diabetes medication, 25% more in the treated group responded positively than those in the control group (95% CI 10% to 50%; P=0.004)
In an age and sex matched case control study, 30 adolescents with high blood pressure were compared to 30 controls from the same clinic. The mean birth weights of the two groups were compared using a paired t-test. The results indicated that the control group was 150 g heavier with a standard error of 100 g.Which one of these is the most appropriate conclusion?
Which of the following is true in logistic regression analysis?
In a trial for a new treatment of lung disease, a traditional regime was given to 130 patients, 30 of whom died, while the new treatment was given to 125 patients, 20 of whom died. ¨¨Which of the following tools will be useful in calculating whether the above results are due to chance?
Which of the following statements is true regarding box plots?
A two-sample t-test comparing weight loss after two different diet regimes yield a P-value of 0.001.Which one of the following statements can be deducted from this finding?
A study shows that of children with asthma, 25% have a first-degree relative with asthma compared with only 10% of a sample of children without asthma. Which of the following is true?
A study of 500 men shows a significant correlation between their blood pressures and weights (r = 0.45, P = 0.0014).Which one of the following is true?
A screening test is found to have a sensitivity of 90% and a specificity of 95%.Which of the following is the best answer?