Purpose: The purpose of this study was to determine if the Outcome Questionnaire 45.2 (OQ-45) can be used in the treatment of obesity to predict participant dropout and initial treatment success, in terms of weight loss (Lambert et. al, 2002a). The OQ-45 has been used with success to predict dropout from psychotherapy in clinical populations. It was hypothesized that higher pretreatment OQ-45 scores would be associated with less program completion and less weight loss by the end of treatment.
Method: The study employed a non-experimental time series design. Seventy-eight participants were recruited from the three local obesity treatment programs, which varied in length from 8 to 12 weeks. Participants were asked to complete the OQ-45 and report their current weight at the beginning of each treatment session.
Analysis: Of the 76 participants with valid pretreatment OQ-45 scores, 27.6% had scores at or above the cutoff value of 64, indicating psychological distress. Overall, one-third (32.9%) of participants completed their treatment program by attending at least half of the eight sessions. Participants with high OQ-45 cutoff scores were significantly less likely to complete the treatment program compared to those with low scores (14.3% vs. 40.0% respectively, p = 0.03). Pretreatment OQ-45 cutoff scores did not predict either attendance at the second treatment session or weight loss success in terms of pounds lost. However, even when controlling for gender, ethnicity, and treatment site, high OQ-45 scores predicted program dropout (OR = 4.41 [95% Cl = 1.07 - 18.10] p = .039), but not weight loss failure.
Implications for Preventive Care: Obesity has proven to be especially difficult to treat, in part due to the high attrition rates from treatment programs. This study demonstrates the potential use of the OQ-45 in obesity treatment to predict participants who are more likely to drop out of treatment. This may allow health care professionals to focus attention on those at increased risk for attrition, thereby improving treatment outcomes.
","abstract_html":"<p><strong>Purpose:</strong> The purpose of this study was to determine if the Outcome Questionnaire 45.2 (OQ-45) can be used in the treatment of obesity to predict participant dropout and initial treatment success, in terms of weight loss (Lambert et. al, 2002a). The OQ-45 has been used with success to predict dropout from psychotherapy in clinical populations. It was hypothesized that higher pretreatment OQ-45 scores would be associated with less program completion and less weight loss by the end of treatment.</p> <p><strong>Method:</strong> The study employed a non-experimental time series design. Seventy-eight participants were recruited from the three local obesity treatment programs, which varied in length from 8 to 12 weeks. Participants were asked to complete the OQ-45 and report their current weight at the beginning of each treatment session.</p> <p><strong>Analysis: </strong>Of the 76 participants with valid pretreatment OQ-45 scores, 27.6% had scores at or above the cutoff value of 64, indicating psychological distress. Overall, one-third (32.9%) of participants completed their treatment program by attending at least half of the eight sessions. Participants with high OQ-45 cutoff scores were significantly less likely to complete the treatment program compared to those with low scores (14.3% vs. 40.0% respectively, p = 0.03). Pretreatment OQ-45 cutoff scores did not predict either attendance at the second treatment session or weight loss success in terms of pounds lost. However, even when controlling for gender, ethnicity, and treatment site, high OQ-45 scores predicted program dropout (OR = 4.41 [95% Cl = 1.07 - 18.10] p = .039), but not weight loss failure.</p> <p><strong>Implications for Preventive Care:</strong> Obesity has proven to be especially difficult to treat, in part due to the high attrition rates from treatment programs. This study demonstrates the potential use of the OQ-45 in obesity treatment to predict participants who are more likely to drop out of treatment. This may allow health care professionals to focus attention on those at increased risk for attrition, thereby improving treatment outcomes.</p>","abstract_has_math":false,"creators":["Arechiga, Adam L."],"institution":null,"degree_name":"Doctor of Public Health (DrPH)","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Edward Fujimoto","Helen Hopp Marshak","David Vermeersch"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2006,"date_issued":"2006-06-01T07:00:00Z","date_published":"2006-06-01T07:00:00Z","updated_at":"2026-07-24T02:54:01Z","subjects":["Health Services Research","Preventive Medicine","Quantitative Psychology","Obesity -- prevention and control; Outcome Assessment (Health Care); Treatment Outcome."],"languages":["English"],"rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/1479","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Edward Fujimoto","Helen Hopp Marshak","David Vermeersch"]},{"key":"dc:creator","label":"Author","values":["Arechiga, Adam L."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Public Health (DrPH)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Health Services Research","Preventive Medicine","Quantitative Psychology","Obesity -- prevention and control; Outcome Assessment (Health Care); Treatment Outcome."]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsrepository.llu.edu/etd/1479"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Purpose: The purpose of this study was to determine if the Outcome Questionnaire 45.2 (OQ-45) can be used in the treatment of obesity to predict participant dropout and initial treatment success, in terms of weight loss (Lambert et. al, 2002a). The OQ-45 has been used with success to predict dropout from psychotherapy in clinical populations. It was hypothesized that higher pretreatment OQ-45 scores would be associated with less program completion and less weight loss by the end of treatment.
Method: The study employed a non-experimental time series design. Seventy-eight participants were recruited from the three local obesity treatment programs, which varied in length from 8 to 12 weeks. Participants were asked to complete the OQ-45 and report their current weight at the beginning of each treatment session.
Analysis: Of the 76 participants with valid pretreatment OQ-45 scores, 27.6% had scores at or above the cutoff value of 64, indicating psychological distress. Overall, one-third (32.9%) of participants completed their treatment program by attending at least half of the eight sessions. Participants with high OQ-45 cutoff scores were significantly less likely to complete the treatment program compared to those with low scores (14.3% vs. 40.0% respectively, p = 0.03). Pretreatment OQ-45 cutoff scores did not predict either attendance at the second treatment session or weight loss success in terms of pounds lost. However, even when controlling for gender, ethnicity, and treatment site, high OQ-45 scores predicted program dropout (OR = 4.41 [95% Cl = 1.07 - 18.10] p = .039), but not weight loss failure.
Implications for Preventive Care: Obesity has proven to be especially difficult to treat, in part due to the high attrition rates from treatment programs. This study demonstrates the potential use of the OQ-45 in obesity treatment to predict participants who are more likely to drop out of treatment. This may allow health care professionals to focus attention on those at increased risk for attrition, thereby improving treatment outcomes.
"]},{"key":"dc:title","label":"Title","values":["Using the Outcome Questionnaire 45.2 in Obesity Treatment"]}]}],"canonical_facts":{"dc:contributor":["Edward Fujimoto","Helen Hopp Marshak","David Vermeersch"],"dc:creator":["Arechiga, Adam L."],"dc:description.abstract":["Purpose: The purpose of this study was to determine if the Outcome Questionnaire 45.2 (OQ-45) can be used in the treatment of obesity to predict participant dropout and initial treatment success, in terms of weight loss (Lambert et. al, 2002a). The OQ-45 has been used with success to predict dropout from psychotherapy in clinical populations. It was hypothesized that higher pretreatment OQ-45 scores would be associated with less program completion and less weight loss by the end of treatment.
Method: The study employed a non-experimental time series design. Seventy-eight participants were recruited from the three local obesity treatment programs, which varied in length from 8 to 12 weeks. Participants were asked to complete the OQ-45 and report their current weight at the beginning of each treatment session.
Analysis: Of the 76 participants with valid pretreatment OQ-45 scores, 27.6% had scores at or above the cutoff value of 64, indicating psychological distress. Overall, one-third (32.9%) of participants completed their treatment program by attending at least half of the eight sessions. Participants with high OQ-45 cutoff scores were significantly less likely to complete the treatment program compared to those with low scores (14.3% vs. 40.0% respectively, p = 0.03). Pretreatment OQ-45 cutoff scores did not predict either attendance at the second treatment session or weight loss success in terms of pounds lost. However, even when controlling for gender, ethnicity, and treatment site, high OQ-45 scores predicted program dropout (OR = 4.41 [95% Cl = 1.07 - 18.10] p = .039), but not weight loss failure.
Implications for Preventive Care: Obesity has proven to be especially difficult to treat, in part due to the high attrition rates from treatment programs. This study demonstrates the potential use of the OQ-45 in obesity treatment to predict participants who are more likely to drop out of treatment. This may allow health care professionals to focus attention on those at increased risk for attrition, thereby improving treatment outcomes.
"],"dc:identifier":["https://scholarsrepository.llu.edu/etd/1479"],"dc:language":["English"],"dc:rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"dc:subject":["Health Services Research","Preventive Medicine","Quantitative Psychology","Obesity -- prevention and control; Outcome Assessment (Health Care); Treatment Outcome."],"dc:title":["Using the Outcome Questionnaire 45.2 in Obesity Treatment"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Public Health (DrPH)"]},"updated_at":"2026-07-24T02:54:01Z"}