Significant mental health impacts on Christchurch mosque attack survivors, and their whanau

Otago University research followed nearly 190 of the 250 survivors -- and bereaved family members -- in the first three years, post-attack.

It's found more than 60-percent of people developed PTSD, anxiety, or major depressive disorders -- many suffering combinations of all three.

Lead author, Dr Ruqayya Sulaiman-Hill says the study's lessons are important.

She says it highlights how to service those of differing ethnic backgrounds, and reviews whether our health services adequately supports terrorism survivors.