Table 1.

Report concordance for drinking and smoking behavior

		Agreement		Disagreement
Variable	χ2	Absence of behavior	Presence of behavior	Under-report	Over-report
Target perception and friend self-report
Drinking, y/na,b	53.71***	161	30	20	21
Smoking, y/na,c,d	27.61***	190	11	19	12
Heavy drinking, ≥7 drinking episodes	18.60***	182	5	45	0
Friend perception and target self-report
Drinking, y/n	53.05***	166	19	7	40
Smoking, y/n	40.62***	192	12	7	21

Notes: y/n = yes/no.

^aAge as predictor of concordance;

^btime spent with friends as predictor of concordance;

^cnegative relationship quality as predictor of concordance;

^dtarget problem behavior as predictor of concordance.

^***p < .001.