Table 1.

Samples Included in Nicotine Biomarker Modeling and Prediction

Characteristic	MEC	UW-TTURC
Participant N	2239	1864
Age,a mean (SD)	63.9 (7.2)b	43.4 (11.3)b
Female N (%)	1199 (53.6%)b	1090 (58.5%)b
Ethnicity N (%)
African American	364 (16.3%)	260 (14.0%)
Native Hawaiian	311 (13.9%)	—
Japanese American	674 (30.1%)	—
Latinos	453 (20.2%)	—
White	437 (19.5%)	1604 (86.0%)
Cigarettes per day	b	b
1–10	1168 (52.2%)	99 (5.3%)
11–20	870 (38.9%)	988 (53.1%)
21–30	119 (5.3%)	533 (28.6%)
≥31	82 (3.5%)	242 (13.0%)

Ethnicity proportions not tested. MEC = Multiethnic Cohort; UW-TTURC = University of Wisconsin Transdisciplinary Tobacco Use Research Center.

^aMEC age at biospecimen collection; UW-TTURC age at baseline interview.

^b p < .001.