Smoking Patterns and Stimulus Control in Intermittent and Daily Smokers
Figure 2
Cigarette consumption by time of day for (a) daily smokers (DS) and (b) intermittent smokers (ITS).
Cigarettes consumed within each time block were averaged across all days of the week. Error bars are standard errors. Both means and standard errors are estimated using GEE analysis. Note that the span of y-axes differ between the two panels, with that for DS five times greater than that for ITS; the different axes are necessary to better illustrate the magnitude of the changes within each group.