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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2013 Apr 28;132(3):528–534. doi: 10.1016/j.drugalcdep.2013.03.020

Table 2.

Self-reported income by source for pretreatment and during-treatment periods.

Pretreatment 3-month income During-treatment 3-month income Statistics

Income source % Endorsing of total sample (N = 418) Median (IQR) for participants endorsing income source % Endorsing of total sample (N = 418) Median (IQR) for participants endorsing income source Paired t-test for full sample, p- value
Total income from all sources 99% (n = 412) $2,820 ($1,130–5,030) 96% (n = 403) $2,160 ($880–3,430) t(416) = −5.39, p <.001
Earned income from jobs 55% (n = 230) $1,900 ($580–4,270) 45% (n = 189) $1,200 ($540–2,930) t(416) = −5.70, p <.001
Illegal income 28% (n = 117) $1,070 ($250–4,000) 9% (n = 36) $600 ($110–1,720) t(417) = −3.33, p <.001
Public assistance sources
 Food stamps 57% (n = 239) $260 ($110–480) 59% (n = 247) $440 ($230–500) t(417) = 4.77, p <.001
 Rent supplements 11% (n = 46) $960 ($270–1,950) 11% (n = 48) $1,210 ($540–1,800) t(417) = 0.20, p =.84
 Supplemental security 13% (n = 54) $1900 ($1,360–2,040) 16% (n = 67) $1750 ($1,100–2,040) t(417) = 1.35, p =.18
 Social security disability 10% (n = 40) $2,050 ($1,820–2,400) 12% (n = 51) $1,740 ($790–2,330) t(417) = 0.09, p =.93
 Other social welfare 21% (n = 88) $450 ($160–990) 19% (n = 79) $620 ($230–1,010) t(417) = 0.38, p =.70
 Unemployment/worker’s comp/vocational 8% (n = 33) $580 ($150–1,380) 5% (n = 21) $1,280 ($610–2,130) t(417) = 0.47, p = .64
Other sources
 Alimony and child support 5% (n = 22) $430 ($270–1,200) 4% (n = 17) $410 ($210–1,260) t(417) = 0.66, p = .51
 Support from family/friends 53% (n = 223) $160 ($50–650) 42% (n = 177) $210 ($70–520) t(417) = −3.12, p = .002
 Gambling wins 10% (n = 40) $50 ($10–130) 6% (n = 27) $60 ($10–270) t(417) = −0.27, p = .79

Notes. All monetary values are reported in 2008 dollars and rounded to nearest $10. Individual sources are reported only when n > 5, but all sources are included in the total income. During-treatment income is income reported during the 3-month treatment period. Pretreatment income is a 3-month estimate of income calculated from self-reported past year income at study intake. Earned income includes under the table jobs, seasonal positions, and salaried or benefited positions. Medians are reported only for those individuals reporting income from a given source, whereas the t-tests reflect the full sample (including those with $0 income from a given source). IQR = interquartile range.