Incidence and outcomes of major trauma in New Zealand: findings from a feasibility study of New Zealand's first national trauma registry.

AIMS: The aim of the study was to pilot the feasibility of long-term outcomes data collection from adult major trauma survivors in New Zealand. This initial paper aims to characterise the New Zealand major trauma population in terms of long-term disability and functional outcomes after major trauma. METHODS: A prospective cohort study of adults who had survived major trauma was conducted between June 2015 and December 2016 at two major trauma centres in Auckland. RESULTS: Of 256 trauma referrals, 112 (44%) were confirmed eligible and consented. One hundred completed the survey at six months and 83 at 12 months. A majority of the study sample were male (72%), under 65 years (84%), with a disproportionally higher number of Maori in the sample (23%). At six months post-injury, the majority of participants were categorised as experiencing either moderate disability (37%) or good recovery (42%). Half of the participants experienced moderate pain at both 6 and 12 months post-injury (50% and 52% respectively), and problems with their usual activities at six months post-injury (51%). CONCLUSIONS: Most study participants made a good recovery, but there was still a large group of people experiencing disability, pain and not in paid employment at 12 months post-injury.

Measuring Neurobehavioral Functioning in People With Traumatic Brain Injury: Rasch Analysis of Neurobehavioral Functioning Inventory.

OBJECTIVE: To examine internal construct validity of the Neurobehavioral Functioning Inventory (NFI) by applying Rasch analysis. SETTING: An outpatient rehabilitation program trial in New Zealand employing a goal-setting intervention in people with traumatic brain injury (TBI). PARTICIPANTS: One hundred eight people (mean age = 46 years; 73% male) between 6 months and 5 years post-TBI. DESIGN: Rasch analysis of the NFI (Partial Credit Model). RESULTS: Three NFI subscales were not unidimensional and at least 4 items in each subscale had disordered response categories. Two items showed differential item functioning by age, 1 item by educational attainment, and 2 items were found to misfit the overall construct. These items were excluded from the total score calculation. The revised scale fit the Rasch model and supported the internal construct validity of the NFI. CONCLUSIONS: Current scoring of the NFI subscales for people with TBI in New Zealand does not meet the requirements of the Rasch model. The revised version of NFI can improve the interpretation of scores but should be further tested with people with TBI in other settings.