Table 3.
Mean (±1 SD) income quartile group differences in cocaine purchasing, expenditures and use, and anticipated change in expenditures.
| Income Quartile | Q1 (n = 21) $275–$784 |
Q2 (n = 21) $785–$1050 |
Q3 (n = 20) $1051–$1738 |
Q4 (n = 21) $1739–$5800 | df | F | p |
|---|---|---|---|---|---|---|---|
| Drug history and use questionnaire (DHUQ) | |||||||
| Past-month cocaine use days (#) | 10.5 (8.4)a | 14.3 (7.0)a | 14.8 (7.9)ab | 21.3 (8.4) b | 3, 81 | 6.73 | .000 |
| Past-week cocaine use days (#) | 2.8 (2.1)a | 3.1 (1.8)ab | 3.5 (1.8)ab | 4.6 (2.3)b | 3, 81 | 3.08 | .032 |
| Avg. cocaine/use-day (# $10 units) | 2.1 (1.7)a | 3.7 (2.7)ab | 4.6 (4.2)ab | 5.2 (4.7)b | 3, 81 | 3.12 | .031 |
| Cocaine purchasing and use patterns (CPUP) | |||||||
| Current pattern | |||||||
| Cocaine purchase amount ($) | 56.19 (84.81) | 31.19 (15.08) | 43.50 (32.81) | 53.00 (31.72) | 3, 82 | 1.11 | .352 |
| Cocaine purchase time (min) | 28.1 (20.6) | 28.2 (18.1) | 28.0 (29.9) | 29.4 (34.2) | 3, 82 | 0.13 | .998 |
| Cocaine use daily (# $10 units) | 4.1 (3.9)a | 8.6 (7.1)ab | 12.0 (13.7)b | 9.1 (6.0)ab | 3, 80 | 3.01 | .035 |
| Cocaine purchases weekly (#) | 3.8 (3.8)a | 5.5 (5.8)a | 5.5 (3.7)a | 11.4 (12.7)b | 3, 82 | 4.13 | .009 |
| Hypothetical amount [$] that would be spent on cocaine daily (due to changes in income): | |||||||
| Increase income by 50% | 45.14 (37.58)a | 67.67 (38.49)a | 75.00 (46.53)a | 141.18 (107.10)b | 3, 67 | 7.08 | .000 |
| Decrease income by 50% | 17.78 (15.07)a | 22.33 (13.21)ab | 39.17 (43.43)ab | 60.29 (49.26)b | 3, 67 | 5.23 | .003 |
| New cocaine dealer | 33.89 (30.61)a | 38.86 (17.39)a | 59.44 (42.87)ab | 93.53 (68.64)b | 3, 67 | 6.28 | .001 |
| No help from family/friends | 23.24 (24.43)a | 19.82 (16.83)a | 33.17 (50.17)ab | 82.33 (101.79)b | 3, 60 | 3.74 | .016 |
| No government aid | 15.59 (12.61)a | 29.67 (19.68)ab | 44.41 (60.28)ab | 76.47 (89.94)b | 3, 65 | 3.64 | .017 |
Values are means (±1 SD). Means that share superscript letters do not significantly differ.