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Table 1 Patients' baseline characteristics.

From: Use of nicotine substitute prescribed at hourly plus ad libitum intake or ad libitum for heavy smokers willing to quit: a randomized controlled trial

  NNS
1 dose per hour/12 h a day
NNS
Dose when cravings appear (control)
  n = 25 n = 25
Age   
   Mean (SD) 40.2 (11.4) 40.8 (10.1)
Sex   
   % male* 60% 84%
Education   
   % high school/university 52% 58.3%
Health   
   Psychiatric comorbidities* 44% 24%
Smoking habits   
   Daily intake; mean cig/day (SD) 29.8 (11.4) 30 (10.3)
   Baseline CO (ppm); mean (SD) 42.0 (16.1) 40.9 (19.0)
   Years of consumption; mean (SD) 18.9 (11.0) 21.0 (9.0)
   Previous attempts; mean (SD)* 2.2 (1.7) 3.1 (3.1)
  1. *Over 20% relative difference between groups.
  2. Cig: cigarettes; CO: carbon monoxide; SD: standard deviation.