{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/120591"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/120591","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effects of repeated breathalyzer use on BAC level and self-estimation accuracy","abstract":"Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01","abstract_html":"Submission published under a 24 month embargo labeled &#x27;Closed Access&#x27;, the embargo will last until 2025-05-01","abstract_has_math":false,"creators":["Lu, Yang"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Psychology","degree_department":null,"school":null,"contributors":["Fairbairn, Catharine E."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2023,"date_issued":"2023-05","date_published":"2023-05","updated_at":"2026-07-22T22:24:57Z","subjects":["Alcohol","Aud","Self-monitoring","Bac","Self-awareness","Intoxication","Breathalyzer"],"languages":["en","eng"],"rights":["Copyright 2023 Yang Lu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/120591","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Fairbairn, Catharine E."]},{"key":"dc:creator","label":"Author","values":["Lu, Yang"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2023-05","2023-05-04"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Psychology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Alcohol","Aud","Self-monitoring","Bac","Self-awareness","Intoxication","Breathalyzer"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2023 Yang Lu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/120591"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01","The student, Yang Lu, accepted the attached license on 2023-05-04 at 09:28.","The student, Yang Lu, submitted this Thesis for approval on 2023-05-04 at 09:43.","This Thesis was approved for publication on 2023-05-04 at 16:36.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19331 on 2023-09-01 at 17:22:23","Alcohol is a leading contributor to death and a major risk factor for illness. Lifetime prevalence of DSM-5 alcohol use disorder (AUD) in the United States is 29.1%, with only 19.8% ever receiving treatment (Grant et al., 2015). AUD treatments often involve self-monitoring of alcohol use and improving awareness of intoxication. With the popularization of mobile health solutions, consumer-grade breathalyzers can be a useful, accessible tool for objectively self-monitoring blood alcohol concentration (BAC) and training people to accurately self-assess their intoxication. The current study analyzes nationwide proprietary breathalyzer data across a six-year period to investigate whether breathalyzer usage (Repeated Use) and the time elapsed since first breathalyzer use (Time) led to changes in BAC level and BAC self-estimation accuracy. The effects of BAC feedback on BAC level were examined in a sample of 1,450,151 observations. A subsample of 385,945 observations was used for BAC self-estimation accuracy models. In the mixed effects multilevel model with Repeated Use and Time as covariates, both led to an increase in BAC level; Repeated Use, b = 0.00032, t = 31.78, p < 0.0001; Time, b = 0.00001, t = 10.41, p < 0.0001. In the set of models examining how, as covariates, Repeated Use and Time affect BAC self-estimation accuracy, Repeated Use increased this accuracy (Absolute Difference, b = -0.00051, ERR = 0.99949 t = -3.99, p < 0.0001; Percentage Difference, b = -0.04647, t = -11.43, p < 0.0001), while Time decreased accuracy (Absolute Difference, b = 0.00008, ERR = 1.00008, t = 7.50, p < 0.0001; Percentage Difference, b = 0.00221, t = 6.96, p < 0.0001). Results point to complex outcomes linked with repeated BAC monitoring, indicating potential mixed utility for BAC self-monitoring interventions delivered in isolation. Future research might explore individual differences in effects of BAC monitoring, as well as person-level associations between BAC level and self-estimation accuracy."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effects of repeated breathalyzer use on BAC level and self-estimation accuracy"]}]}],"canonical_facts":{"dc:contributor":["Fairbairn, Catharine E."],"dc:creator":["Lu, Yang"],"dc:date":["2023-05","2023-05-04"],"dc:description":["Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01","The student, Yang Lu, accepted the attached license on 2023-05-04 at 09:28.","The student, Yang Lu, submitted this Thesis for approval on 2023-05-04 at 09:43.","This Thesis was approved for publication on 2023-05-04 at 16:36.","DSpace SAF Submission Ingestion Package generated from Vireo submission #19331 on 2023-09-01 at 17:22:23","Alcohol is a leading contributor to death and a major risk factor for illness. Lifetime prevalence of DSM-5 alcohol use disorder (AUD) in the United States is 29.1%, with only 19.8% ever receiving treatment (Grant et al., 2015). AUD treatments often involve self-monitoring of alcohol use and improving awareness of intoxication. With the popularization of mobile health solutions, consumer-grade breathalyzers can be a useful, accessible tool for objectively self-monitoring blood alcohol concentration (BAC) and training people to accurately self-assess their intoxication. The current study analyzes nationwide proprietary breathalyzer data across a six-year period to investigate whether breathalyzer usage (Repeated Use) and the time elapsed since first breathalyzer use (Time) led to changes in BAC level and BAC self-estimation accuracy. The effects of BAC feedback on BAC level were examined in a sample of 1,450,151 observations. A subsample of 385,945 observations was used for BAC self-estimation accuracy models. In the mixed effects multilevel model with Repeated Use and Time as covariates, both led to an increase in BAC level; Repeated Use, b = 0.00032, t = 31.78, p < 0.0001; Time, b = 0.00001, t = 10.41, p < 0.0001. In the set of models examining how, as covariates, Repeated Use and Time affect BAC self-estimation accuracy, Repeated Use increased this accuracy (Absolute Difference, b = -0.00051, ERR = 0.99949 t = -3.99, p < 0.0001; Percentage Difference, b = -0.04647, t = -11.43, p < 0.0001), while Time decreased accuracy (Absolute Difference, b = 0.00008, ERR = 1.00008, t = 7.50, p < 0.0001; Percentage Difference, b = 0.00221, t = 6.96, p < 0.0001). Results point to complex outcomes linked with repeated BAC monitoring, indicating potential mixed utility for BAC self-monitoring interventions delivered in isolation. Future research might explore individual differences in effects of BAC monitoring, as well as person-level associations between BAC level and self-estimation accuracy."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/120591"],"dc:language":["en","eng"],"dc:rights":["Copyright 2023 Yang Lu"],"dc:subject":["Alcohol","Aud","Self-monitoring","Bac","Self-awareness","Intoxication","Breathalyzer"],"dc:title":["Effects of repeated breathalyzer use on BAC level and self-estimation accuracy"],"dc:type":["text"],"thesis:degree_discipline":["Psychology"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:24:57Z"}