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Table 1 Characteristics of subjects

From: Association of menstrual phase with smoking behavior, mood and menstrual phase-associated symptoms among young Japanese women smokers

  Mean (SD) Range
Age (years) 21.1 (1.7) 197–25
Daily number of cigarettes smoked 17.3 (5.2) 10.5–30.0
Years of smoking 3.6 (2.1) 1–10
FTND score 2.2 (2.1) 0–7
Duration of menstrual cycle (days) 30.5 (2.5) 37–34
Duration of follicular phase (days) 8.2 (2.1) 6–9
Duration of luteal phase (days) 12.6 (1.4) 12–15
  1. FTND: Fagerström Test for Nicotine Dependency.