title: Use of weekly assessment data to enhance evaluation of a subjective wellbeing intervention.
abstract: OBJECTIVE
  While intervention effects in target outcomes have typically been tested based on change from baseline to post-intervention, such approaches typically ignore individual differences in change, including time taken to see improvement. The present study demonstrates how weekly patient-reported data may be used to augment traditional pre-post intervention evaluations in order to gain greater insights into treatment efficacy.
  
  
  METHODS
  Two hundred and fifty-two adolescent boys and girls (M age = 13.6 years, SD = 0.6 years) from four secondary schools in Victoria, Australia, were assigned by school into control (n = 88) or intervention (n = 164) groups. The intervention group participated in a 6-week course designed to improve subjective wellbeing (SWB) by fostering resilience, coping skills, and self-esteem. In addition to baseline, post-intervention, and 3-month follow-up assessments of SWB, intervention group participants also completed weekly summarise of affective experiences for the duration of the intervention phase.
  
  
  RESULTS
  While standard pre-post data showed significant improvement in SWB for the intervention group relative to controls, weekly data showed individual differences in the trajectory of change during this intervention phase; low SWB individuals experienced initial worsening of symptoms followed by improvement in the second half of the intervention phase, whereas high SWB individuals experienced initial gains, followed by a plateau from Week 4 onwards.
  
  
  CONCLUSIONS
  Addition of weekly data provided greater insights into intervention effects by: (1) contradicting the notion that early responsiveness to treatment is predictive of level of improvement by post-intervention, and (2) providing data-based insights into ways to enhance the intervention.
authors.affiliation: School of Psychology, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia.
authors.forename: Lucia
authors.initials: L
authors.lastname: Colla
authors.affiliation: School of Psychology, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia. matthewf@deakin.edu.au.
authors.forename: Matthew
authors.initials: M
authors.lastname: Fuller-Tyszkiewicz
authors.affiliation: School of Psychology, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia.
authors.forename: Adrian J
authors.initials: AJ
authors.lastname: Tomyn
authors.affiliation: School of Psychology, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia.
authors.forename: Ben
authors.initials: B
authors.lastname: Richardson
authors.affiliation: School of Psychology, Deakin University, 221 Burwood Highway, Burwood, VIC, 3125, Australia.
authors.forename: Justin D
authors.initials: JD
authors.lastname: Tomyn
mesh_terms: D000223:Adaptation, Psychological; D000293:Adolescent; D005260:Female; D005500:Follow-Up Studies; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D011788:Quality of Life / Q000523:psychology*; D055500:Resilience, Psychological; D012572:School Health Services; D012649:Self Concept; D016896:Treatment Outcome; D014739:Victoria
keywords: Patient-reported outcomes; School intervention; Subjective wellbeing; Trajectories of change