{"id":"W3135886475","doi":"10.1177/2325967121992375","title":"Incidence of Head Contacts, Penalties, and Player Contact Behaviors in Youth Ice Hockey: Evaluating the “Zero Tolerance for Head Contact” Policy Change","year":2021,"lang":"en","type":"article","venue":"Orthopaedic Journal of Sports Medicine","topic":"Traumatic Brain Injury Research","field":"Medicine","cited_by":18,"is_retracted":false,"has_abstract":true,"ca_institutions":"Hotchkiss Brain Institute; Alberta Children's Hospital; Université Laval; University of Calgary","funders":"Alberta Children's Hospital Foundation; Canadian Institutes of Health Research; Alberta Innovates - Health Solutions; Hotchkiss Brain Institute","keywords":"Ice hockey; Concussion; Medicine; Demography; Rate ratio; Poisson regression; Zero tolerance; Cohort; Poison control; Injury prevention; Confidence interval; Psychology; Physical medicine and rehabilitation; Environmental health; Population; Internal medicine","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":[0.005539161,0.0002395301,0.000248781,0.00116056,0.0004966157,0.001146791,0.001094127,0.0005505206,0.001603384],"category_scores_gemma":[0.01437952,0.0003308787,0.0009027747,0.0008972783,0.0004815159,0.000660949,0.001011684,0.000565921,0.0001910553],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.002327526,"about_ca_system_score_gemma":0.003165239,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.1075241,"about_ca_topic_score_gemma":0.1211805,"domain_scores_codex":[0.9973916,0.000635084,0.0002988528,0.000398555,0.0007381964,0.0005376571],"domain_scores_gemma":[0.9933437,0.001028745,0.003336497,0.0003400126,0.001411592,0.0005393676],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"observational","study_design_gemma":"observational","study_design_scores_codex":[0.0001416853,0.00009758649,0.9970911,0.00003364233,0.00005535618,0.0000120203,0.0001855241,0.00003451501,0.00001485136,0.00002460077,0.0001184046,0.002190677],"study_design_scores_gemma":[0.00001122329,0.0003277718,0.9979341,0.00008661522,0.00006161934,0.00002849123,0.001044033,0.0002193639,0.00007681679,0.00001468506,0.0001901683,0.000005040437],"study_design_candidate":"observational","study_design_consensus":"observational","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.9984738,0.0002089469,0.0001369632,0.00004587942,0.00001404602,0.00009179774,0.0005750961,0.00000264727,0.0004508356],"genre_scores_gemma":[0.9986004,0.0002204917,0.000226016,0.00002894704,0.000009316001,0.0001195966,0.0005153149,0.00000239043,0.0002775766],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.1075241,"threshold_uncertainty_score":0.2137965,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.1449931659996081,"score_gpt":0.4173783962458825,"score_spread":0.2723852302462744,"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."}}