. 2020 Sep 3;2020(9):CD007668. doi: 10.1002/14651858.CD007668.pub3

18. Comparison 4. 'Driving whilst intoxicated program' (DWI) + incarceration versus incarceration alone: days driving after five or more drinks, self‐reported (skewed data).

Study	Outcome	Experimental group: DWI + incarceration			Incarceration			Statistic	Comments
Study	Outcome	n	Mean	SD	n	Mean	SD	Statistic	Comments
Woodall 2007	Days driving after 5 or more drinks in past 30 days; self‐reported; at 6 months	30	0.87	3.73	13	0.08	0.28	None provided	Favours neither group Completer analysis^a
Woodall 2007	Days driving after 5 or more drinks in past 30 days; self‐reported; at 12 months	30	0.57	1.63	13	0.38	0.77	None provided	Favours neither group Completer analysis^a
Woodall 2007	Days driving after 5 or more drinks in past 30 days; self‐reported; at 24 months	30	0.50	1.25	13	0.31	0.63	None provided	Favours neither group Completer analysis^a
Woodall 2007	Days driving after 5 or more drinks in past 30 days; self‐reported; mean improvement over baseline; at 24 months	30	3.02	4.93	13	2.28	4.22	None provided	Favours neither group Completer analysis^a
ANOVA: analysis of variance; AsPD: antisocial personality disorder; DWI: 'Driving whilst intoxicated program';n: numbers of participants; SD: standard deviation.

^aTrial investigators reported a significant overall main effect of time (P < 0.001), "indicating a decline in self‐reported drinking and driving from intake to post‐incarceration assessments" (column 2, p 982) and a significant AsPD‐by‐time interaction (P < 0.001) "resulting from the fact that the AsPD participants showed a greater improvement over time than the non‐AsPD participants" (column 2, p 982), but that the group‐by‐time interaction was not significant (ANOVA, mixed factorial design).