Fig. 4.

Individual and mean (horizontal lines) alcohol-placebo changes in driving performance as measured by the standard deviation of lateral position (SDLP). Change scores for each individual study are shown separately for males (squares) and females (triangles) and for individuals for whom gender data was missing (circles). Dotted lines show thresholds for impaired (changes above 2.4 cm) and improved driving (changes below −2.4 cm). Study 1: Ramaekers et al. 1992, Study 2: Vermeeren and O’Hanlon 1998, Study 3: Ramaekers et al. 2000, Study 4: Vermeeren et al. 2002a, Study 5: Vermeeren et al. 2002b, Study 6: Kuypers et al. 2006, Study 7: van der Sluiszen et al. 2016, Study 8: Schumacher et al. 2011, Study 9: Schumacher 2014