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. Author manuscript; available in PMC: 2021 Jun 17.
Published in final edited form as: Eur J Neurosci. 2018 Dec 11;50(3):2201–2210. doi: 10.1111/ejn.14282

Table 1.

Characteristics of smokers and nonsmokers.

Smoker
 Nonsmoker
 p
T C T C
Number 48 33 28 14 0.423
Age 37.98±7.50 38.21±7.07 38.04±8.07 37.57±8.75 0.995
Education 13.77±2.89 13.42±2.84 15.12±4.16 15.58±5.58 0.123
Smoking initiation 20.42±4.60 19.88±3.46 -- -- 0.571
Smoking years 17.56±7.12 18.33±7.83 -- -- 0.647
Cigarettes/day 23.46±10.47 23.58±11.18 -- -- 0.962
Pack years 20.86±13.75 22.69±17.10 -- -- 0.596
FTND 5.29±2.32 4.65±2.04 -- -- 0.205
FD 0.24±0.12 0.22±0.11 0.21±0.07 0.19±0.09 0.323

Pack-years=cigarettes/day*smoking years/20; FD: framewise displacement (before scrubbing); FTND: Fagerström Test for Nicotine