Table 2.

Mean plasma cotinine values by time to first cigarette after waking in a community-based study, New York

nPlasma cotinine (ng/mL)P value for pairwise comparison of mean plasma cotinine levels
95% CL6-30 min31-60 min>60 min
Time to first cigarette (min)
    <596437380-4940.05<0.001<0.001
    6-3079352291-4130.020.03
    31-6040229140-3170.85
    >6027215110-321

NOTE: Mean values are adjusted for cigarettes per day, sex, and race.

Abbreviation: CL, confidence limits.