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Table 6 Tests for equivalence between treatment group subjects who attended and did not attend a notification meeting

From: Opting out of treatment: Self-selection bias in a randomized controlled study of a focused deterrence notification meeting

Variable No. Did not attend n1 Attended n2 Test stat. p-Valueb
Less than HS educ. 65 p1 = 0.5600 25 p2 = 0.4500 40 Z = 0.86 0.3881
Unemployed 64 p1 = 0.6250 24 p2 = 0.6250 40 Z = 0 1.000
Substance abuse 66 p1 = 0.9583 24 p2 = 0.6905 42 Z = 2.56 0.0104 c
Single 65 p1 = 0.8400 25 p2 = 0.8000 40 Z = 0.40 0.6859
Probation (vs. parole) 65 p1 = 0.6667 24 p2 = 0.6829 41 Z = − 0.14 0.8924
Age 67 μ1 = 32.09 25 μ2 = 32.00 42 T = 0.03 0.9748
Age, first fel. conv. 64 μ1 = 21.21 24 μ2 = 22.25 40 T = − 0.83 0.4095
Years in prison 66 μ1 = 3.82 25 μ2 = 4.67 41 T = − 0.45 0.6519
Prior misdem. conv.a 66 μ1 = 0.96 25 μ2 = 0.80 41 T = 0.39 0.6976
Prior felony conv.a 67 μ1 = 1.88 25 μ2 = 1.33 42 T = 0.86 0.3968
Prior felony arrestsa 67 μ1 = 3.56 25 μ2 = 1.76 42 T = 1.76 0.0875 c
Prior imprisonmentsa 66 μ1 = 1.04 25 μ2 = 0.63 41 T = 0.87 0.3918
Prior probationsa 65 μ1 = 1.36 25 μ2 = 0.70 40 T = 1.62 0.1164
Prior parolesa 66 μ1 = 0.64 25 μ2 = 0.37 41 T = 1.07 0.2929
  1. aUnequal variances option used in the test
  2. bTwo-sided p-values reported
  3. c p < 0.10