{"id":"W3173126663","doi":"10.1136/tobaccocontrol-2020-056371","title":"Trends in e-cigarette brands, devices and the nicotine profile of products used by youth in England, Canada and the USA: 2017–2019","year":2021,"lang":"en","type":"article","venue":"Tobacco Control","topic":"Smoking Behavior and Cessation","field":"Medicine","cited_by":68,"is_retracted":false,"has_abstract":true,"ca_institutions":"University of Waterloo","funders":"Canadian Institutes of Health Research; National Cancer Institute; Public Health Agency of Canada","keywords":"Nicotine; Advertising; Electronic cigarette; Business; Tobacco control; Environmental health; Medicine; Psychiatry; Public health; Nursing","routes":{"ca_aff":true,"ca_fund":true,"ca_venue":false,"about_ca":true,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.0009960253,0.0003506145,0.000612771,0.002667447,0.001352279,0.0019935,0.001369873,0.0006749218,0.003232209],"category_scores_gemma":[0.003175045,0.0003945585,0.001163759,0.005376708,0.0006854766,0.001115442,0.001257689,0.001294522,0.0005313734],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.01846066,"about_ca_system_score_gemma":0.02233394,"about_ca_topic_candidate":true,"about_ca_topic_consensus":true,"about_ca_topic_score_codex":0.9869347,"about_ca_topic_score_gemma":0.9901169,"domain_scores_codex":[0.99844,0.0000770242,0.0001473416,0.0002270442,0.0006585669,0.0004501121],"domain_scores_gemma":[0.9932092,0.0002646757,0.001227301,0.00008738488,0.004268852,0.0009424958],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.00009779833,0.00002631135,0.9832139,0.0003268945,0.0001184016,0.000108522,0.0009161811,0.0001082492,0.0001509576,0.0002080729,0.006637332,0.008087225],"study_design_scores_gemma":[0.000004678485,0.0000157726,0.99309,0.0002092107,0.00004682782,0.0001265886,0.00183532,0.0001413231,0.00007188778,0.00001529978,0.004426488,0.00001670777],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.8826445,0.01393883,0.0003952206,0.00220575,0.00009597365,0.0001282348,0.09316837,0.0001053748,0.007317686],"genre_scores_gemma":[0.9481915,0.01039347,0.0007774768,0.001275919,0.00005206989,0.0001176845,0.03413802,0.00004921066,0.005004598],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.01846066,"threshold_uncertainty_score":0.1339421,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.01281338580112727,"score_gpt":0.2379216989995028,"score_spread":0.2251083131983755,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}