Table 3.

MNLFA Estimated Symptom Psychometric Properties^*

Symptom	Observed Probability of Endorsement		Intercept	Loading	Estimated Probability of Endorsement for ND severity score =1
	NESARC	SECASP
Withdrawal^b	.18	.49	−10.78	5.52	.01
Withdrawal symptoms uncomfortable/upsetting/interfere w/work, social activities^b	.11	.47	−8.80	4.42	.01
Smoke to keep from feeling withdrawal symptoms^b	.18	.51	−8.25	4.19	.02
Smoke despite promising yourself not to	NA	.60	−2.61 ^LF −2.33^WF −3.88 ^DF	1.78	.30^LF .37^WF .11^DF
Use more frequently than intended ^b	.31	.58	−3.02	1.92	.25
Tried to cut down/quit but could not	.44	.47	−3.48^N −5.30 S	2.57	.29 ^N .06 ^S
Chain smoking ^b	.32	.37	−4.15^LQ −3.37^MQ −2.58^HQ	1.73	.08 ^LQ .16 ^MQ .30 ^HQ
Give up activities to use ^b	.07	.17	−5.03	1.59	.04
Health problem	.45	.44	−1.88^N,LQ −1.22 ^N,MQ −0.54 ^N,HQ −3.00^N,LQ −2.33 ^N,MQ −1.65 N, HQ	0.87^LF 1.48^WF 1.84^DF	.27 ^N,LQ,LF .11 ^S,LQ,LF .41 ^N,MQ,LF 19^,S,MQ,LF .58 ^N,HQ,LF .31^,SHQ,LF .49 ^N,LQ,DF .24^S,LQ,DF .65 ^N,MQ,DF.38^S,MQ,DF .79 ^N,HQ,DF .55^S,HQ,DF
Emotional problem ^b	.14	.35	−5.52	2.39	.04
Strong desire to smoke	NA	.41	−6.97	3.21	.02
Need to smoke more to feel satisfied ^b	.14	.59	−1.29	1.37	.52
Need to smoke more to feel effects	NA	.72	−3.48 ^LF −7.00^WF −6.05 ^DF	2.04	.19 ^LF .02 ^WF .01 ^DF
Increased use by 50% or more	.15	NA	−4.25	1.69	.07

Note. In the mixed model parameterization, higher (more positive) intercepts reflect lower severity, and higher loadings reflect greater discrimination.

NA = not measured. Superscripts indicate parameter estimates for study (N=NESARC; S=SECASP), smoking quantity (LQ=low quantity (−1 sd), MQ=mean quantity, HQ=high quantity (+1 sd)), and smoking frequency (LF=less than weekly smoking, WF=weekly, DF=daily smoking).

Using the Benjamini-Hochberg correction for multiple significance testing.

Low endorsement rate prohibited tests for DIF.

Significantly different (p<.05) symptom prevalence rates between studies based on bivariate chi-square tests.