Table 1.

Study participant characteristics and differences between menthol and nonmenthol smokers

All (n = 105)Menthol (n = 71, 67.6%)Nonmenthol (n = 34, 32.4%)
Variablen (%)Mean ± SDn (%)Mean ± SDn (%)Mean ± SDPa
Age (y)43.1 ± 9.643.8 ± 9.341.4 ± 10.90.25
Age (y), categorical
 <44 yrs old55 (52.4)34 (47.9)21 (61.8)0.18
 ≥44 yrs old50 (47.6)37 (52.1)13 (38.2)
Gender
 Male67 (63.8)43 (60.6)24 (70.6)0.32
 Female38 (36.2)28 (39.4)10 (29.4)
Race
 AA63 (60.0)58 (81.7)5 (14.7)<0.00001
 EA38 (36.2)12 (16.9)26 (76.5)
 Biracial4 (3.8)1 (1.4)3 (8.8)
Yrs smoked (y)22.9 ± 9.922.5 ± 9.823.7 ± 10.30.57
Yrs smoked (y), categorical
 <22 yrs52 (49.5)39 (54.9)13 (38.2)0.11
 ≥22 yrs53 (50.5)32 (45.1)21 (61.8)
Plasma cotinine (ng/mL)252.6 ± 103.3247.5 ± 97.3263.4 ± 115.60.46
Plasma cotinine, categorical
 Low (<200)35 (33.3)23 (32.4)12 (35.3)0.96
 Medium (200–279)35 (33.3)24 (33.8)11 (32.4)
 High (>279)35 (33.3)24 (33.8)11 (32.4)
NMR0.38 ± 0.220.37 ± 0.240.41 ± 0.170.44
NMR, categorical
 Q1 (<0.238)25 (23.8)20 (28.2)5 (14.7)0.25
 Q2 (0.238–0.34)27 (25.7)19 (26.8)8 (23.5)
 Q3 (0.341–0.458)27 (25.7)18 (25.4)9 (26.5)
 Q4 (>0.458)26 (24.8)14 (19.7)12 (35.3)
FTND scoring5.0 ± 2.34.8 ± 2.15.4 ± 2.70.20
FTND scoring, categorical
 <5 points44 (41.9)32 (45.1)12 (35.3)0.31
 5–6 points33 (31.4)23 (32.4)10 (29.4)
 >6 points27 (25.7)15 (21.1)12 (35.3)
  • Abbreviations: AA, African Americans; EA, European Americans.

  • aP values represent differences in menthol versus nonmenthol smokers for each characteristic. Continuous variables were evaluated by two-sample t tests (italics), and χ2 tests were used to investigate the differences in distributions of categorical variables from menthol to nonmenthol smokers.