Table 3.

Differential item functioning, and the severity and discrimination parameters, of DSM-IV nicotine dependence criteria across the 2001–2002 and the 2004–2005 NESARC time points

		Severity parameter			Discrimination parameter			Time 2
DSM-IV criteria	G2 (df = 2)	Time 1	Time 2	Difference	Time 1	Time 2	Difference	Mean	SD
WITHDRAWAL	70.4	−1.00	−0.63	0.37*	1.65	2.03	0.38*	0.21	0.70
TOLERANCE	147.5	1.17	1.45	0.28*	2.25	2.63	0.38	0.22	0.78
GIVE UP	12.6	2.56	2.21	-0.35*	1.09	1.19	0.10	0.18	0.74
CUT DOWN	59.6	−0.63	−0.79	−0.16*	1.30	1.53	0.23	0.17	0.75
TIME SPENT	64.7	1.07	1.10	0.03*	1.58	2.17	0.59*	0.20	0.73
CONTINUED USE	110.9	−0.11	−0.37	−0.26*	1.63	1.85	0.22	0.15	0.75
LARGER	39.0	0.80	0.62	−0.18*	2.27	3.04	0.77*	0.16	0.71

Note. The G² test with 2 df evaluates differences between the waves in both severity and discrimination parameters. Differences between the waves on either parameter are evaluated using 1 df tests. p Values for df 1 tests were adjusted using the Benjamini–Hochberg procedure. Severity parameters that (a) represent a statistically significant difference between waves and (b) exceed our effect size criteria (0.25) are shown in bold. NESARC = National Epidemiologic Survey on Alcohol and Related Conditions.

*p < .05.