Test of Difference in Proportion for Commitments to Corrections


Previous - Next


Test of Difference in Proportion for Commitments to Corrections

Girls' commitments to corrections were significantly more likely to be for misdemeanor offenses than boys'. This was found for all offense categories, except status, noncompliance, sex, and "other" offenses. While few youth are committed to IDOC for status offenses, all of those commitments were for class A misdemeanors, therefore no statistically significant difference between boys and girls exists. Similarly, none of the girls' commitments to corrections was for sex offenses. Table 22 depicts the results of Z-test of proportions analyses for misdemeanor IDOC commitments by offense category in FY04.

Table 22
Results of Z-Test for difference in proportions of misdemeanor commitments to IDOC by offense category, FY04

Offense category Female proportion Male proportion Z-score Confidence level (a) P-value Significant
Person 40.5% 17.1% 4.58 99% pLess Than.01 Yes
Sex 0.0% 9.6% - - - -
Weapons 50.0% 4.7% 3.67 99% pLess Than.01 Yes
Property 32.0% 14.6% 3.27 99% pLess Than.01 Yes
Drug 40.0% 5.7% 3.06 99% pLess Than.01 Yes
Noncompliance 62.5% 54.5% 0.39 99% pGreater Than.05 No
Status* 100.0% 100.0% 0.00 99% pGreater Than.50 No
Other 33.3% 10.0% 0.98 99% pGreater Than.05 No
All arrests 37.8% 14.2% 8.26 99% pLess Than.01 Yes

* All status offense commitments are for class A misdemeanors.
Source: Illinois Department of Corrections

Girls' involvement in the Illinois juvenile justice system was statistically more likely to be for a misdemeanor or less serious offense.


Previous - Next