|Proportion of samples in which a majority of respondents held a particular perception of relative risk (%)|
|Product comparison||Samples*||Less||Less or equal||Equal||Equal or greater||Greater||Don't know†||None‡||Unknown§|
|SLT vs CCs (ref)||Overall (n=77)||18||3||13||6||0||0||27||32|
|General population (n=20)||20||0||20||15||0||0||30||15|
|SLT users (n=13)||38||8||15||0||0||0||31||8|
|SLT non-users (n=6)||0||17||0||0||0||0||83||0|
|ECs vs CCs (ref)||Overall (n=46)||70||0||0||0||0||4||17||9|
|General population (n=11)||64||0||0||0||0||0||27||9|
|EC users (n=16)||75||0||0||0||0||0||19||6|
|EC non-users (n=1)||0||0||0||0||0||100||0||0|
|NRT vs CCs (ref)||Overall (n=20)¶||35||0||10||5||0||0||0||50|
|General population (n=4)||75||0||0||25||0||0||0||0|
|NRT users (n=2)¶||50||0||0||0||0||0||0||50|
|NRT non-users (n=2)¶||0||0||0||0||0||0||0||100|
|SLT vs NRT (ref)||Overall (n=2)¶||0||0||0||0||0||100||0||0|
|ECs vs NRT (ref)||Overall (n=1)¶||0||0||0||0||0||0||100||0|
Bold results indicate the proportion of samples in which a majority of respondents held the epidemiologically correct perception of relative risk, for each product comparison.
*Sample sizes reflect those extracted from observational studies for which quantitative comparable findings were reported. Samples from the following studies were excluded due to their experimental nature: SLT versus CCs.39 ,43 Samples from the following studies were excluded due to use of an incompatible measure: SLT versus CCs;45 ECs versus CCs;69 ,73 ECs versus NRT.69
†Denotes samples in which a majority of respondents reported not knowing the relative risk of given products.
‡Denotes samples in which a particular perception of relative risk was not held by a majority of respondents.
§Denotes samples for which insufficient information was given to discern whether a majority of respondents held a particular perception of relative risk.
¶Denotes findings which should be interpreted with caution, given limitations with available data.