ACC say assault rates in dwellings in Marlborough have hit a five-year high but police recorded crime statistics for attacks in the home show a reduction.
Figures released by ACC revealed 49.70 people out of every 10,000 in Marlborough made a claim for injuries received from an assault in a dwelling during the year ending June 30.
Assault injuries led to 1855 days of lost productivity within Marlborough.
Common injuries included bruises, sprains and strains.
The ACC statistics did not provide a breakdown of whether the assaults in the home were family violence related or alcohol or drugs-driven.
But police said the number of reported assaults in dwellings in Marlborough had gone down.
Police spokeswoman Barbara Dunn said reported assaults in dwellings had fallen from 249 in 2012-13 to 231 in 2013-14.
Family violence interventions had contributed to the downward trend, she said.
ACC spokesman Glenn Donovan acknowledged ACC data was approximate.
"We acknowledge there are some holes in our data," Donovan said.
ACC took some of their assault data through recorded offences from the police.
Assault rates were an approximation to start "community conversations" and introduce injury prevention initiatives, he said.
Not all claimants described their experience on ACC documentation as an assault, he said.
"To the best of our ability we try and approximate claims for assaults. We have developed a matrix to look for descriptive words such as hit, struck, punched, argument and row.
"ACC claims are not fault based. It is possible that a person lodges an ACC claim for an assault but don't report it to police."
- The Marlborough Express
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