QUESTION 6a

Calculate percent frequencies and observed/expected ratios in the table below:

Types of Illness Wet Areas

Population Illness %
Dry Areas

Population Illness %
O/E Ratio
Birth defects 120 births 24 176 births 12
Nervous breakdowns 149 adults 13 510 adults 7
Urinary disease 314 total 22 826 total 21
Asthma 314 total 14 826 total 11
Hyperactivity 127 children 11 316 children 2

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Postgraduate Diploma in Occupational Health (DOH) - Modules 3: Occupational Medicine & Toxicology (Basic) by Profs Mohamed Jeebhay and Rodney Ehrlich, Health Sciences UCT is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 South Africa License. Major contributors: Mohamed Jeebhay, Rodney Ehrlich, Jonny Myers, Leslie London, Sophie Kisting, Rajen Naidoo, Saloshni Naidoo. Source available from here. For any updates to the material, or more permissions beyond the scope of this license, please email healthoer@uct.ac.za or visit www.healthedu.uct.ac.za. Last updated Jan 2007.
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