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Table 1 Characteristics of the subjects by machine-measured nicotine yield of cigarette

From: Smoking cigarettes of low nicotine yield does not reduce nicotine intake as expected: a study of nicotine dependency in Japanese males

Characteristics Machine-measured nicotine yield (mg/cigarette) Total  
  0.1 0.2–0.8 0.9–2.4   p
Number of subjects 87 223 148 458  
Mean and SD of mahchine-measured nicotine yield (mg/cigarette) 0.1 0.5 ± 0.2 1.1 ± 0.4 0.6 ± 0.4  
Mean and SD of age 53.6 ± 10.4 50.6 ± 9.34 50.8 ± 10.4 51.2 ± 9.9 0.07
Mean and SD of number of cigarettes per day 23.4 ± 12.2 24.5 ± 10.7 24.4 ± 9.5 24.4 ± 10.6 0.93
Mean and SD of FTND 5.1 ± 2.5 5.4 ± 2.3 5.6 ± 2.0 5.4 ± 2.2 0.21
Number of smokers at each category of FTND      
FTND score 0–3 19 (21.8%) 47 (21.1%) 21 (14.2%) 87 (19.0%)  
FTND score 4–6 40 (46.0%) 100 (44.8%) 78 (52.7%) 218 (47.6%) 0.41
FTND score 7–10 28 (32.2%) 76 (34.1%) 49 (33.1%) 153 (33.4%)  
Number of smokers having attempted to quit 50 (61.0%) 132 (59.5%) 84 (56.8%) 269 (58.9%) 0.73
Number of smokers at each stage of behavioral change in quitting process      
Precontemplation-1 16 (18.6%) 47 (21.3%) 58 (39.7%) 121 (26.7%) 0.001
Precontemplation-2 48 (55.8%) 131 (59.3%) 62 (42.5%) 241 (53.2%)  
Contemplation 20 (23.3%) 33 (14.9%) 23 (15.6%) 76 (16.8%)  
Preparation 2 (2.3%) 10 (4.5%) 3 (2.1%) 15 (3.3%)  
Mean and SD of urinary cotinine concentration (mean-SD, mean+SD*) 535 (1782,160) 770 (1981,299) 1010 (2071,492) 784 (484, 1264) <0.001
  1. FTND:Fagerström Test for Nicotine Dependence P for difference is examined by analysis of variance or chi-square test * Back-transformation of log-transformed data