O-180 CAREX Canada: prevalence and level of occupational asbestos exposure in Canada in 2016
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
<h3>Introduction</h3> Despite a federal asbestos ban, occupational asbestos exposure persists in Canada due to asbestos in older buildings and other legacy products or lingering imported materials. We updated CAREX Canada’s prevalence of exposure estimate from 2006 to 2016, and assessed the level of occupational exposure by industry, occupation, province/territory, and sex. <h3>Material and Methods</h3> Labour force data from the 2016 Census of Population and proportions of workers exposed by occupation and industry, which were previously developed for 2006 and updated here to reflect new knowledge and changes in exposures, were combined to estimate exposure by occupation (4-digit 2016 NOC), industry (4-digit 2012 NAICS), province/territory, and sex. Changes between the 2006 and 2016 job and industry coding systems were accounted for using Statistics Canada concordance tables. Levels of exposure (low, moderate, high), were qualitatively assigned for each occupation and industry intersection using expert assessment, considering workers’ proximity and access to asbestos-containing material, and the condition and content of asbestos. <h3>Results</h3> Approximately 235,000 workers (1.5%) are occupationally exposed to asbestos in Canada in 2016. Most are male (89%) and in the low (49%) or moderate (46%) exposure categories. The construction sector and associated jobs (e.g. carpenters, trades helpers and laborers) account for the majority; an estimated 157,000 workers are exposed in the industry, followed by public administration (29,000) and health care and social assistance (19,000). Other occupations with exposed workers include janitors, caretakers, and building super intendents (19,000) and light duty cleaners (12,000). The estimated prevalence of workers exposed increased from 2006 to 2016 due to increases in the labour force and the addition of some previously unrecognized groups. <h3>Conclusions</h3> Workers continue to be exposed to asbestos in Canada. Our results illustrate the shift from high exposures to lower-level exposures, which are associated with remaining asbestos-containing materials in the built environment.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it