Table 2.

Number of cases over a period of seven months (November 2012–May 2013 and November 2013–May 2014) with approximate population at risk in that period by sub-district. These figures were used to calculate incidence of diarrhoea presented in Figure 2.

Sub-Districts Names	November 2012–May 2013		November 2013–May 2014
	Number of Cases	Population at Risk *	Number of Cases	Population Risk *
Northern	2642	29,288	2832	28,928
Tygerberg	4837	54,367	4599	53,698
Klipfontein	2580	35,617	3009	35,178
Mitchell’s Plain	4225	44,904	4992	44,351
Eastern	2924	49,805	3765	49,191
Khayelitsha	4814	47,099	5667	46,520
Southern	2433	44,536	3264	43,987
Western	2576	38,622	3458	38,147

* The population at risk was less in the later period than the earlier period based on estimates received from Statistics South Africa via the Western Cape Government: Health Department.