Table 2.

Descriptive statistics of CO, total NNAL, 1-HOP, and total cotinine stratified by cigarettes per day

Strata, cigarettes/dNCarbon monoxide* (ppm)
Total NNAL (pmol/mg creatinine)
Total 1-HOP (pmol/mg creatinine)
Total cotinine§ (nmol/mg creatinine)
Mean (SD)Min-maxMean (SD)Min-maxMean (SD)Min-maxMean (SD)Min-max
(0-5)405.6 (4.8)1-190.8 (1.0)0-3.81.2 (0.9)0.1-4.27.0 (7.9)0.2-29.5
(5-10)3210.0 (5.4)2.5-261.2 (0.9)0.2-3.61.5 (1.0)0.5-5.713.3 (8.1)3.5-38.8
(10-15)3715.4 (7.3)3-312.8 (3.9)0.2-23.92.1 (1.5)0.3-5.724.2 (26.0)1.7-159.4
(15-20)9919.9 (8.6)5-452.1 (1.2)0.5-7.02.3 (6.0)0.1-53.923.4 (13.2)0.5-70.0
(20-25)6321.7 (7.5)6-482.2 (1.0)0.5-6.41.6 (1.2)0.4-5.327.0 (12.9)8.2-68.9
(25-30)6925.9 (11.6)8-552.6 (1.3)0.6-6.21.9 (1.5)0.33-8.027.5 (14.1)3.6-71.2
(30-35)1727.9 (13.9)8-702.1 (1.0)0.8-3.92.1 (1.4)0.9-5.322.9 (12.8)5.0-45.6
(35-40)2830.2 (12.5)12-643.7 (2.0)0.8-8.31.7 (1.2)0.4-4.827.0 (14.2)2.4-57.8
(40-45)338.3 (23.5)18-642.7 (1.7)1.4-4.51.6 (0.8)0.6-2.133.4 (16.1)22.8-52.0
(45-50)1029.1 (15.4)13-562.3 (1.0)1.1-4.01.7 (1.1)0.8-4.117.6 (11.3)3.6-40.5
(55-60)118.0 (—)4.2 (—)1.1 (—)32.3 (—)
(95-100)125.0 (—)1.8 (—)0.9 (—)26.2 (—)
  • * Fifty-six missing values.

  • Forty-six missing values.

  • Thirty-seven missing values.

  • § Thirty-seven missing values.