Step

Description

Unweighted N Excluded by Step

Unweighted N Remaining after Step

1

NHANES 2007-2014 respondents

40617

2

& Participated in interview and MEC examination

1451

39166

3

& Eligible for mortality follow-up, with non-missing vital status and follow-up time

15315

23851

4

& Aged 21 - 79 at interview

3070

20781

5

& Non-missing sex, race/ethnicity, educational attainment, BMI, marital status, and IPR

2026

18755

6

& Non-missing urinary NNAL and urinary creatinine > 0

1227

17528

7

& Never, current or former cigarette smoker reporting no other past 5-day tobacco or nicotine use at MEC examination

2762

14766