National health figures show alcohol-related harm in Canterbury has almost halved since before the earthquakes.

The New Zealand Health Survey 2011-14 shows hazardous drinking in Canterbury is at 9.7 percent.

That compares to 18.8 percent in the 2006/07 survey.

High blood pressure, asthma and anxiety disorders all saw a small increase after the quakes.

However psychological stress remained roughly the same.