Analysis of event incidence

The analysis of event incidence form allows very detailed analysis of the occurrence of any event over any period of time.

- the event of interest. Any of the defined events can be analysed.

- the analysis period

- the interval used in the result displays to divide up the analysis period. An analysis covering a number of year might have 12 months as the interval to allow comparisons of year on year.

- The period between two events when the events are considered as separate occurrences rather than a continuation of the first event. For example, mastitis events within two days of each other may be considered as two occurrences of the same outbreak, rather than two unrelated events.

Population at risk:   The population of study can be selected according to a broad range of criteria.  Note:  the event analysis is done on an animal days basis. An animal's record is examined for every day of the analysis period. For each day that an animal satisfies the criteria it contributes an animal day (1/365 animal year). If, while satisfying the criteria, it has an occurrence of the event of interest then that is an event. The overall events per animal year is the total events divided by the total animal years.
Age (days): Any required age limit. Leaving blank results in no restriction according to age.
Parity number: Parities (lactations) limits. Leaving blank results in no restriction according to parity.
Days after calving: Limit according to days after calving. Leaving blank results in no restriction.
Animal sex/class, Weaning status, Fertility status and Lactation status:  Only classes checked () will be included in the population. If the criteria is not required then leave all the items in the group as checked.
When all the criteria are specified click  . The defined population is then analysed and the total events and events per animal year displayed. The events can be analysed in a number of different ways:

Event list:  A list of all the events including the animal ID, date, results and categories. The records can be sorted by the values in any column, so that animals with repeat occurrences of an event are readily identifiable.
Events by result: The number of events recorded per interval unit (defined in  )
Events by category: The number of categories  recorded per interval unit
Incidence by result:
The incidence (number of occurences per animal year) of results by interval unit
Incidence by category:
The incidence (number of occurences per animal year) of categories by interval unit