Research paper · RP23

Write It Out, Forty Years On

Frattaroli’s 2006 random-effects average for experimental disclosure was r = .075. Two decades later the best available synthesis for depression, anxiety and stress in healthy and subclinical adults is r = .06 (Hedges g = −0.12, 95% CI −0.21 to −0.04), from 31 randomised trials and 4,012 participants. The effect has not grown. It has found a niche. This PRISMA-2020 systematic review asked what expressive writing does for wellbeing, affect and health-care use in healthy adults from 2006 to 2026, and for whom. Population: healthy adults. Practice: timed private writing, usually 15–20 minutes across three to four sessions. Comparator: neutral writing or no writing. Designs: randomised and controlled trials. Trauma-focused writing programmes sit outside this wellness lane. Searches of PubMed, PsycINFO, Scopus, Web of Science, Google Scholar, CTRI, ClinicalTrials.gov and OSF, plus backward citation from prior reviews, identified eight subsequent syntheses and twenty verified healthy-adult trials. A new primary-study REML pool was not computed: cell-level means and standard deviations were not extractable for five or more eligible trials with usable confidence intervals. The quantitative backbone is therefore the published healthy-adult syntheses, converted and compared with Frattaroli. Effects on symptoms are small and delayed. Sessions one to three days apart outperform weekly spacing. In head-to-head trials, positive-focused writing beats classic disclosure for mood in the general population (mean difference 0.45, 95% CI 0.18 to 0.71). Best-possible-self and gratitude prompts are the most consistent positive techniques. Classic disclosure can raise anxiety in people who rarely express emotion, and raised stress in one online pandemic trial. An Asian-sample synthesis was null (g = 0.05). No CTRI-registered trial has tested the practice in India-resident working adults. Certainty of evidence is low. For an Indian workplace programme, treat writing as a short, private, countable rep — not a trauma exercise and not a stand-alone fix.