Figure 2

Number of states that increased, decreased, or showed no change^afor policy domains derived from SHPPS questionnaire.^a Policy domain score was considered “No change” from 2000 to 2006 if the value changed by less than 20% of the policy domain change score standard deviation. For example, the standard deviation for change in the Collaboration factor was 0.358, so, states where the policy domain score increased or decreased by less than 0.072 (0.358*20%) were classified as “no change”. Most states in the “no change” category had policy domain change scores equal to 0. Note: For both “Exemption” factors (P3 and P4) an increase from 2000 to 2006 (in green) means more exemptions from PE allowed. While shown in green, this is considered a negative policy change.