. Author manuscript; available in PMC: 2010 Sep 1.

Published in final edited form as: Health Psychol. 2009 Sep;28(5):519–526. doi: 10.1037/a0015197

Table 1.

Characteristics of daily cigarette consumption, estimated by four methods

	Daily Consumption		Rounded at 10		Invariant
	Mean	SD	Mean	SD	%
Global report	26.36^a	10.35	^* 60.9%	48.9%	--
TLFB (pre-monitoring)¹	26.66^a	12.83	^*64.3%^a	40.3%	51.1% ^a
TLFB (monitored)	24.61^b	9.35	^*42.8%^b	29.6%	3.5% ^b
EMA	21.97^c	8.56	10.2%^c	8.3%	0.0%^c

Note. Rounded at 10 refers to the percent of days on which reported consumption was an even multiple of 10; it is equal to 10 x Whipple’s index. Invariant refers to the percent of subjects who reported exactly the same cigarette consumption on all days. Daily Consumption means with different superscript letters differ significantly from each other, p<0.0001. Round 10 means with different superscript letters differ significantly from each other, p<0.0003; Global report could not be tested, as it was a single dichotomous value (rounded or not) for each subject (whereas the other values are the percentage of days within a subject that were rounded). Invariant percentages with different subscripts differ significantly from each other, p<0.0001.

significantly different from the proportion expected under a random distribution, p<0.0001

Subset of subjects, n=194