Table 1.
Study participant characteristics and differences between menthol and non-menthol smokers.
| Variable | All (n=105)
|
Menthol (n=71, 67.6%)
|
Non-menthol (n=34, 32.4%)
|
pa | |||
|---|---|---|---|---|---|---|---|
| n (%) | Mean ± SD | n (%) | Mean ± SD | n (%) | Mean ± SD | ||
| Age (y) | 43.1 ± 9.6 | 43.8 ± 9.3 | 41.4 ± 10.9 | 0.25 | |||
| Age (y), categorical | |||||||
| < 44 yrs-old | 55 (52.4) | 34 (47.9) | 21 (61.8) | 0.18 | |||
| ≥ 44 yrs-old | 50 (47.6) | 37 (52.1) | 13 (38.2) | ||||
| Gender | |||||||
| Male | 67 (63.8) | 43 (60.6) | 24 (70.6) | 0.32 | |||
| Female | 38 (36.2) | 28 (39.4) | 10 (29.4) | ||||
| Raceb | |||||||
| AA | 63 (60.0) | 58 (81.7) | 5 (14.7) | < 0.00001 | |||
| EA | 38 (36.2) | 12 (16.9) | 26 (76.5) | ||||
| Biracial | 4 (3.8) | 1 (1.4) | 3 (8.8) | ||||
| Yrs smoked (y) | 22.9 ± 9.9 | 22.5 ± 9.8 | 23.7 ± 10.3 | 0.57 | |||
| Yrs smoked (y), categorical | |||||||
| < 22 yrs | 52 (49.5) | 39 (54.9) | 13 (38.2) | 0.11 | |||
| ≥ 22 yrs | 53 (50.5) | 32 (45.1) | 21 (61.8) | ||||
| Plasma cotinine (ng/ml) | 252.6 ±103.3 | 247.5 ±97.3 | 263.4 ±115.6 | 0.46 | |||
| 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) | ||||
| NMR | 0.38 ± 0.22 | 0.37 ± 0.24 | 0.41 ± 0.17 | 0.44 | |||
| 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 scoringc | 5.0 ± 2.3 | 4.8 ± 2.1 | 5.4 ± 2.7 | 0.20 | |||
| FTND scoring, categorical | |||||||
| < 5 points | 44 (41.9) | 32 (45.1) | 12 (35.3) | 0.31 | |||
| 5–6 points | 33 (31.4) | 23 (32.4) | 10 (29.4) | ||||
| > 6 points | 27 (25.7) | 15 (21.1) | 12 (35.3) | ||||
a
p-values represent differences in menthol vs. non-menthol smokers for each characteristic. Continuous variables were evaluated by two-sample t-tests (Italic), and chi square (X2) tests were used to investigate the differences in distributions of categorical variables from menthol to non-menthol smokers.
b
AA: African-Americans, EA: European Americans.
c
FTND: Fagerstrom Test for Nicotine Dependence.