"Incident" or "Incidence" - What to use?

“Incident” と “Incidence” について

Incident: An incident is something that happens, often something that is unpleasant.

Example: In that incident the level of contamination of the maize involved was between 6 and 16 ppm.

Incidence: The incidence of something bad, such as a disease, is the frequency with which it occurs, or the occasions when it occurs.

Example: The incidence of histologically proved hepatocellular carcinoma increased to 1.4 per 100,000 population

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