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. 2017 Mar 28;23(3):674–682. doi: 10.1038/mp.2017.23

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Number of intrusive memories of the traumatic event in the intervention and control conditions. (a) Mean number of intrusive memories recorded in a daily diary during the week following a traumatic motor vehicle accident (intention-to-treat analysis). Intervention condition=cognitive task (trauma memory reminder cue plus Tetris computer game play); Control condition=written activity log. There was a significant difference between the intervention condition (n=37, M=8.73, s.d.=11.55, range 0–55) and the control condition (n=34, M=23.26, s.d.=32.99, range 0–120): t(69)=2.80, P=0.005, d=0.67, 95% CI: 0.18, 1.14. Error bars show standard deviations. (b) Frequency scattergraphs (exploratory analysis) showing the time course of the number of intrusive memories recorded in a diary from day 1 (day of trauma) to day 7 for participants who returned the diary in the intervention condition (n=34) and control condition (n=33). The size of the circles represents the number of participants who reported the indicated number of intrusive memories on that particular day, scaled separately for each condition. The solid lines are the fit of the generalized additive model (see Equation (1)) to summarize the number of intrusive memories through the 7-day period.