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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: Am J Orthopsychiatry. 2015 Sep;85(5):452–468. doi: 10.1037/ort0000087

Figure 4. Change Over Time in Predicted Means of School Performance Indicators by Parental Participation in a Drug Treatment Court Program.

Figure 4

The y-axis represents the predicted mean standardized math score, standardized reading score, and probability of missing 18 or more school days (i.e. chronic absenteeism) respectively. Chronic absenteeism is a binary variable that is one if a student missed 18 or more days of school and zero otherwise. A joint Wald test was used to compare the amount change over time between time points for each group. The only statistically significant difference was that children whose parents completed a DTC program experienced a greater decline in reading scores than children whose parents enrolled but did not complete between the year of referral and the year after referral.