Study Characteristics

NHANES III 1988-1994

NHANES 1999-2000

NHANES 2001-2002

NHANES 2003-2004

NHANES 2005-2006

NHANES 2007-2008

Serum cotinine limit of detection (ng/mL)

0.050

0.050

0.050 or 0.015

0.015

0.015

0.015

# of participants with serum cotinine values

22,377

7,284

8,299

7,792

7,761

7,748

Serum cotinine values below the LOD (%)

2,751
(12.3%)

2,743
(37.7%)

1,872
(22.6%)

1,314
(16.9%)

1,368
(17.6%)

1,352
(17.5%)

Total Urine NNAL limit of detection (ng/mL)

-

-

-

-

-

0.0006

# of participants with total urine NNAL values

-

-

-

-

-

7,170

Total urine NNAL values below the LOD (%)

-

-

-

-

-

3172
(44.2%)

# of participants asked about workplace & household SHS smoke exposures

33,994

9,965

11,039

10,122

10,348

10,149