First incident date

The first date the healthcare user was admitted/diagnosed with the condition/event.

Notes: The following field/source was used for each condition/event:

Cancer registration – date of diagnosis (NZCR) Coronary heart disease – incident date from the coronary heart disease indicator in the Health Tracker (see note) Gout – incident date from the gout indicator in the Health Tracker COPD – incident date from the COPD indicator in the Health Tracker Traumatic brain injury – admission date (NMDS) Stroke – admission date (NMDS) Acute myocardial infarction – admission date (NMDS)