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Driving frequency by training and control groups in full sample. Note: Driving frequency means are presented (range 0–7). Driving frequency was the average number of days driven in a week. Training and control groups did not differ on baseline driving frequency (see Table 1, p > .05). Booster training occurred at years 1 and 3. Cohen’s d for speed of processing trained group compared with no-contact control group was 0.10.
