Comparison of severe on-farm injuries to older and younger persons in New South Wales (2012-2016).

OBJECTIVES: To assess and compare rates of severe on-farm injury for older (> 50 years) and younger (15-49 years) cohorts, on NSW farms. DESIGN: Descriptive retrospective epidemiological study of the New South Wales Trauma Registry (Institute of Trauma and Injury Management - ITIM) for persons injured on a farm. SETTING: New South Wales, Australia. PARTICIPANTS: Cases involving persons (≥15 years), with data on the NSW Trauma Registry (2012-16). MAIN OUTCOME MEASURES: Comparison of injury rates and severity between younger (15-49 years) and older (50+ years) cohorts over the 2012-16 period based on Injury Severity Scores (ISS). RESULTS: Older males are injured at a rate that is roughly 18% higher than younger males and 13% higher than the overall injury rate. Older individuals also have significantly longer hospital stays post-injury (P = 0.01), with this being most pronounced for older men (P < 0.01). There was no statistically significant difference in ISS demonstrated between the age cohorts (P = 0.64), except for younger women having higher median ISS than their older female counterparts (P = 0.02). CONCLUSION: Overall, the general trends displayed support the contention that older males are more likely to incur a severe on-farm injury than their younger counterparts. This provides support for a preventative focus targeting older farmers in NSW.

Tetrodotoxin concentrations in Pleurobranchaea maculata: temporal, spatial and individual variability from New Zealand populations.

Tetrodotoxin (TTX) is a potent neurotoxin that has been identified in a range of phylogenetically unrelated marine and terrestrial organisms. Tetrodotoxin was recently detected in New Zealand in Pleurobranchaea maculata (the grey side-gilled sea slug). From June 2010 to June 2011 wild specimens were collected from 10 locations around New Zealand. At one site (Narrow Neck Beach, Auckland) up to 10 individuals were collected monthly for 6 months. Attempts were also made to rear P. maculata in captivity. Tetrodotoxin was detected in samples from eight of the ten sites. The highest average (368.7 mg kg⁻¹) and maximum (1414.0 mg kg⁻¹) concentrations were measured in samples from Illiomama Rock (Auckland). Of the toxic populations tested there was significant variability in TTX concentrations among individuals, with the highest difference (62 fold) measured at Illiomama Rock. Tetrodotoxin concentrations in samples from Narrow Neck Beach varied temporally, ranging from an average of 184 mg kg⁻¹ in June 2010 to 17.5 mg kg⁻¹ by December 2010. There was no correlation between TTX levels and mass. The highest levels correspond with the egg laying season (June-August) and this, in concert with the detection of high levels of TTX in eggs and early larval stages, suggests that TTX may have a defensive function in P. maculata. Only one larva was successfully reared to full maturation and no TTX was detected.