Table 2.

Standardized risk differences summarizing the improvement in balance obtained by matching with respect to socio-demographic and smoking characteristics among adults who made quit attempts in the TUS-CPS, United States, 2002-2003 and 2010-2011*†

	Any Medication		Bupropion		Nicotine		Varenicline
Characteristic	Unmatched	Matched	Unmatched	Matched	Unmatched	Matched	Unmatched	Matched
	Std. Diff	Std. Diff	Std. Diff	Std. Diff	Std. Diff	Std. Diff	Std. Diff	Std. Diff
Propensity Score	0.59	0.01	0.86	0.03	0.48	0.04	0.59	0.00
Age (years)	0.14	−0.03	0.10	0.01	0.07	0.05	0.19	0.06
Age x Age	0.09	−0.03	0.04	0.02	0.03	0.06	0.15	0.06
CPD	0.25	0.04	0.24	0.02	0.23	0.04	−0.07	−0.08
CPD x CPD	0.17	0.04	–	–	–	–	−0.17	−0.02
Sex (female)	0.11	−0.02	0.27	−0.02	0.04	0.07	0.05	−0.09
Education level (any college)	0.12	0.05	0.07	0.02	0.08	0.00	0.03	0.04
Race (white)	0.34	0.02	0.46	−0.04	0.30	0.00	0.12	0.03
Has a home smoking ban (yes)	0.04	−0.02	−0.10	−0.05	−0.07	−0.01	0.33	0.04
Intention to quit smoking (yes)	0.04	0.03	0.21	0.06	0.17	0.00	0.42	−0.01
Ever tried to quit smoking (yes)	0.16	−0.03	0.60	0.04	0.19	−0.06	–	–
Year (2010-11)	0.23	0.02	−0.63	−0.06	−0.19	−0.01	–	–
Used Bupropion (yes)	–	–	–	–	0.30	0.04	0.23	0.08
Used Nicotine (yes)	–	–	0.54	−0.04	–	–	−0.05	0.01
Used Varenicline (yes)	–	–	0.18	0.00	−0.02	−0.04	–	–

^*Values <|0.1| indicate good balance. CPD = average number of cigarettes per day; Std. Diff = standardized mean difference; TUS-CPS= Tobacco Use Supplement to the Current Population Survey.

^†Cells for use of pharmaceutical aids missing when variable is being estimated as outcome or when variable is a constant.