Table 4.

Adjusted odds ratios (95% confidence intervals) showing major predictors of the disagreement between self-report and hair testing: cocaine and marijuana^a

	Cocaine Self = No Hair = Yes N=609	Marijuana Self = No Hair = Yes n=513	Marijuana Self = Yes Hair = No n=519
Demographics
Age	.76 (.61−.95)*	.89 (.70−1.14)	.99 (.80−1.23)
African American	27.74 (8.79−87.50)***	2.29 (.51−10.19)	2.13 (.60−7.52)
Other	5.16 (1.03−25.80)*	QS	1.47 (.26−8.47)
High school education	.79 (.28−2.26)	.48 (.16−1.41)	1.06 (.34−3.24)
Married	.80 (.32−1.98)	.58 (.21−1.58)	.42 (.17−1.06)
Employed	.39 (.15−1.00)	1.26 (.36−4.46)	.85 (.28−2.56)
Drug use — since 1972b	2.14 (.70−6.51)	2.83 (.98−8.18)	27.5 (3.44−220.46)**
Smoking as method of administration	.47 (.11−2.08)	NA	NA
IV as method of administration	.25 (.04−1.70)	NA	NA
Last quit attempt involving inpatient treatmentc	5.84 (1.03−32.93)*	QS	1.09 (.19−6.45)
Psychiatric conditions since 1972d
ASP	.27 (.09−.78)*	.40 (.13−1.26)	1.22 (.47−3.15)
PTSD	.79 (.28−2.19)	1.84 (.59−5.73)	1.46 (.53−4.01)
Depression	.33 (.03−3.20)	.38 (.05−4.57)	.44 (.09−2.14)
Hair Condition
Treatmente	5.89 (.98−35.54)	QS	.97 (.06−17.21)
Body Hair	.38 (.10−1.42)	.45 (.04−4.57)	.66 (.14−3.24)
Short (less than 3 cm)	1.18(.42−3.29)	.81 (.14−4.85)	3.86 (1.11−13.44)*

^aThe disagreement for self-report vs. hair testing was assessed in two ways: apparent underreporting (self-report = no and hair testing = yes); or apparent overreporting (self-report = yes and hair testing = no). There was no case of apparent cocaine overreporting. Significance tests were performed on the beta parameters of predictors of the logistic regressions.

^*p<.05

^**p<.01

^***p<.001.

^bThe measure is for specific drug listed. See the text for definitions.

^cParticipant reported hospitalization for last quit attempt for the specific drug involved. QS = quasi-complete separation (all cases of treated inpatient users were in the agreement cell).

^dBased on DSM—IV.

^ePermanent, dye, bleach, relaxer or rogaine.