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Bridge: mood-outcome evidence

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Cambridge International AS & A Level Psychology (9990), examination year 2027: AI-assisted conceptual alignment to official sources, not teacher or exam-board certification. Syllabus mapping and remaining coverage.

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Original written methods, results and evaluation exercises; partial coverage, teacher approval pending. No practical research, clinical advice or complete syllabus claim.

Subtopics in this topic (3)
  • Bridge: random allocation and an active contact control
  • Bridge: a mood result alongside a Leeds null
  • Bridge: age interactions and unsupported mechanisms

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Question 1Bridge et al. (1988) report 183 eligible women and 22 refusals. The remaining 161 consented and were randomised; seven were excluded after staging detected metastases, leaving 154. Fifteen subsequently dropped out, leaving 139 treatment completers: 47 relaxation, 44 relaxation plus imagery and 48 controls. All groups met researchers weekly; controls talked about themselves. (a) Reconcile the flow and identify the post-allocation exclusion. (b) Evaluate the contact control. (c) Bound generalisation and masking claims. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.4 indicative marks

Bridge et al. (1988) report 183 eligible women and 22 refusals. The remaining 161 consented and were randomised; seven were excluded after staging detected metastases, leaving 154. Fifteen subsequently dropped out, leaving 139 treatment completers: 47 relaxation, 44 relaxation plus imagery and 48 controls. All groups met researchers weekly; controls talked about themselves. (a) Reconcile the flow and identify the post-allocation exclusion. (b) Evaluate the contact control. (c) Bound generalisation and masking claims. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

Cambridge 2027: Partial conceptual match

Bridge: random allocation and an active contact control: selected primary-source aspects only, not whole section or whole study coverage. Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

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Worked guidance

  1. Twenty-two refusals leave 161 consenting women who were randomised before seven were excluded after staging detected metastases. This leaves 154 retained, then 139 treatment completers after 15 losses, matching 47 + 44 + 48. The dropouts were five from relaxation plus imagery, six from relaxation and four from control. The final group sizes should not be described as the original allocation sizes. Post-allocation exclusions can affect the balance randomisation sought to create; the seven excluded women's allocation breakdown is not established here. Treatment completion also does not establish complete questionnaires for every endpoint.
  2. Controls received weekly individual contact and an opportunity to talk, making the comparison stronger than simply leaving them without researcher attention. This helps examine whether the structured packages add something beyond contact. Nevertheless, the activities and expected benefits were different. Participants knew what they were asked to do, so the contact control does not prove that expectancy or reporting effects were identical across groups.
  3. The paper describes consecutive English-speaking outpatients under 70 receiving radiotherapy for early breast cancer at one hospital. Random-number allocation concerns group assignment within that eligible sample, not random sampling of all patients. The six-week course and completer results cannot guarantee effects for metastatic disease, different treatments or long-term outcomes. This is historical written evaluation, not a relaxation programme or a proposal to conduct research with patients.

Self-marking points

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  1. Reconcile 183 - 22 = 161 randomised, followed by seven post-allocation exclusions, 154 retained and 139 treatment completers after 15 dropouts.
  2. Distinguish treatment-completion counts from original allocation and outcome-analysis counts.
  3. Explain what weekly researcher contact controls and leaves uncontrolled.
  4. Identify the early-cancer radiotherapy sample and limits of participant masking.

Examiner tip

Identify the actual sample, endpoint, denominator and source section. Distinguish a result from an interpretation and a group average from an individual claim.

Question 2Bridge et al.'s table II presents initial and six-week mood scores for 39 relaxation, 43 imagery and 46 control participants, fewer than the 139 treatment completers. Their analysis of covariance controls initial scores and tests a predicted ordered treatment trend. Total mood disturbance supports that trend, but the Leeds depression/anxiety measures show no significant group differences. (a) Explain the analysis population and baseline adjustment. (b) Evaluate reporting only the favourable result. (c) Explain why this is not evidence of cancer survival benefit. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.4 indicative marks

Bridge et al.'s table II presents initial and six-week mood scores for 39 relaxation, 43 imagery and 46 control participants, fewer than the 139 treatment completers. Their analysis of covariance controls initial scores and tests a predicted ordered treatment trend. Total mood disturbance supports that trend, but the Leeds depression/anxiety measures show no significant group differences. (a) Explain the analysis population and baseline adjustment. (b) Evaluate reporting only the favourable result. (c) Explain why this is not evidence of cancer survival benefit. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

Cambridge 2027: Partial conceptual match

Bridge: a mood result alongside a Leeds null: selected primary-source aspects only, not whole section or whole study coverage. Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

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Worked guidance

  1. Table II's 39 + 43 + 46 gives 128 observations, not the 139 who completed treatment. Completing the package need not mean complete or analyzable outcome records; the recovered tables do not establish individual missingness reasons. Groups began with different average mood scores, so comparing final means alone can mix initial differences with outcomes. The authors adjusted for initial scores using analysis of covariance, which addresses a measured baseline imbalance under model assumptions, not every bias. The ordered trend does not show that every possible pairwise comparison was individually significant.
  2. Mood disturbance and the Leeds anxiety/depression measures are different endpoints. Reporting only the favourable mood result exaggerates consistency across measures. The Leeds result supplies no statistically detected group difference under this study's analysis, not proof of exact zero effects. The authors discuss possible measurement sensitivity, including symptoms that might have physical causes; that is an explanation to evaluate, not a demonstrated reason to ignore the null.
  3. The measured outcomes were psychological scores during a six-week radiotherapy course. A mood difference is not a measured change in tumour response, recurrence or survival. This trial cannot support a claim that imagery cures cancer or replaces oncology care. Its contribution is narrower: evaluating reported emotional outcomes of structured packages against a contact comparison, with measurement and analysis qualifications retained.

Self-marking points

View marking points
  1. Distinguish the 128 Table II observations from 139 treatment completers and explain adjustment for initial mood.
  2. Distinguish an ordered trend from proof of every pairwise contrast.
  3. Report the Leeds null alongside mood findings without equating null with proof of no effect.
  4. Separate psychological endpoints from tumour response or survival.

Examiner tip

Identify the actual sample, endpoint, denominator and source section. Distinguish a result from an interpretation and a group average from an individual claim.

Question 3Bridge et al. divided the sample around its median age of 54 and report stronger effects for women aged 55 or over on some mood outcomes. Table III age-group headings sum to 44 relaxation, 40 imagery and 46 controls (130), rather than Table II's 128. The discussion suggests work and practice time as possible explanations and also discusses an anger subgroup. (a) Explain an age-by-treatment interaction. (b) Evaluate the proposed explanation. (c) Bound conclusions and reconcile only what these denominators establish. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.4 indicative marks

Bridge et al. divided the sample around its median age of 54 and report stronger effects for women aged 55 or over on some mood outcomes. Table III age-group headings sum to 44 relaxation, 40 imagery and 46 controls (130), rather than Table II's 128. The discussion suggests work and practice time as possible explanations and also discusses an anger subgroup. (a) Explain an age-by-treatment interaction. (b) Evaluate the proposed explanation. (c) Bound conclusions and reconcile only what these denominators establish. Written source analysis only: no human experiments, diagnostic tasks or clinical advice. Primary reading: https://pmc.ncbi.nlm.nih.gov/articles/PMC1835041/ Resource and read sections: Full primary page scans: p1170 Patients and method and Results/table I; p1171 Results/tables II-III and Discussion; p1172 Discussion, including Leeds null and measurement limitations. The adjacent fluorescent-light correction is unrelated to this paper. Coverage boundary: Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

Cambridge 2027: Partial conceptual match

Bridge: age interactions and unsupported mechanisms: selected primary-source aspects only, not whole section or whole study coverage. Selected historical trial methods, mood outcomes and evaluation only; no cancer survival endpoint, clinical recommendation, relaxation instructions or complete stress section. Subgroup findings are not universal treatment rules. Teacher approval pending.

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Worked guidance

  1. An interaction means that the treatment-related pattern differs across the age categories in this sample. It does not mean every older participant improved or that no younger participant could benefit. The authors describe the median-based split as planned before examining the data; retaining that fact is fairer than labelling every subgroup analysis unplanned. Even a planned interaction remains bounded by sample and measurement choices.
  2. The suggestion that older women had more time to practise is a possible mechanism, not an experimentally isolated cause. Work status and practice opportunity were not randomly assigned across ages. Other age-related differences or differential reporting could contribute. The paper's interpretation invites further testing; it cannot establish that freeing time would reproduce the same effect or that age itself is the active ingredient.
  3. Table III's headings sum to 44 + 40 + 46 = 130, unlike Table II's 128 and the 139 treatment completers. Those totals alone do not identify which individuals entered both analyses or why records differ. Dividing a modest sample reduces information within each subgroup, and several mood/anger comparisons permit selective emphasis. Retain the exact endpoint and population rather than assuming a single complete analysis sample. Age patterns and anger findings are not personal treatment rules or evidence of cancer control; the Leeds null and short follow-up remain relevant.

Self-marking points

View marking points
  1. Interpret different treatment patterns across age groups rather than a universal age effect.
  2. Distinguish measured outcomes from a proposed explanation not experimentally isolated.
  3. Distinguish Table III's 130, Table II's 128 and 139 treatment completers without inventing individual overlap or missingness reasons.
  4. Reject age-based personal advice or a universal claim that imagery helps every patient.

Examiner tip

Identify the actual sample, endpoint, denominator and source section. Distinguish a result from an interpretation and a group average from an individual claim.

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