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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Psychopharmacology (Berl). 2013 Jun 10;230(2):10.1007/s00213-013-3150-5. doi: 10.1007/s00213-013-3150-5

Table 2.

Plasma nicotine values (n/mL) at baseline, after three days of use of a cigarette filter that removed 50% of nicotine and tar from cigarettes (“post restriction”), and their difference (N=166).

Baseline Post restriction Difference
Mean 16.4 12.5 −3.7
SD 6.69 7.56 7.77
SE Mean 0.50 0.58 0.60
95% CI Mean (17.3, 15.4) (13.6, 11.3) (−2.6, −4.9)
t-ratio --- --- −6.25
DF --- --- 167
Prob > |t| --- --- <.0001