Parents of children in the Kent Respiratory Study completed questionnaires when their
children were aged five and twelve (Bland *et al.*, 1974).

The data used in the lecture are available as an SPSS file: bronch.sav.

**Reference**

Bland JM, Holland WW, Elliott A. (1974)
The development of respiratory symptoms in a cohort of Kent schoolchildren.
*Bulletin Physio-Pathologie Respiratoire* **10**, 699-716.

Question 1: Using SPSS, cross-tabulate cough by history of bronchitis, making history of bronchitis the row variable and cough the column variable. Carry out a chi-squared test of association.

Question 2: Calculate the odds ratio for the relationship and the relative risk of cough for children with bronchitis before age five compared to those without bronchitis before age five. Quote the results to two decimal places.

Question 3: Now make cough the row variable and history of bronchitis the column variable. (This was how the table was presented in the lecture.) Carry out the chi-squared test of association and calculate the odds ratio and the relative risk. How do the results change?

Question 5: Why does SPSS put the words 'For cohort' in the Risk Estimate table?

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Last updated: 21 November, 2006.