Exercise: Locomotor milestones and babywalkers

This question is based on Locomotor milestones and babywalkers: cross sectional study (Garrett et al. (2002) British Medical Journal 324, 1494.) Read the paper and answer the questions.

Question 1. Baby walker use was reported to start at a median age of 26 weeks, (interquartile range 26-28). What does this tell us about the distribution of age of first use?

Check suggested answer 1.

Question 2. In the table, the difference in mean time to stand alone was 3.32 weeks, (95% confidence interval 4.87 to 1.77). What does this statement mean and what can we conclude?

Check suggested answer 2.

Question 3. In the table, the P value for the difference in mean time to stand alone was <0.0001. What does this statement mean and what can we conclude?

Check suggested answer 3.

Question 4. Can we conclude that babywalkers delay development?

Check suggested answer 4.

Question 5. How might the data on time to roll over influence our interpretation of the results of this study?

Check suggested answer 5.

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Last updated: 23 October, 2006.