In addition to uncertainty and sensitivity analysis results obtained
from Monte Carlo simulation, there were still otheruncertainties in the process of risk estimation. Due to the absence
of data on the consumption distribution of youtiao from different
locations, we assumed that each location had approximately the
same amount of consumption, and the PAHs concentration in
youtiao purchased from Shanghai represented the national levels,
which might cause the uncertainties of BaPeq exposure. The parameters
of body weight (BW) and ingestion amount (IR) were
based on the data of the Chinese National Health and Nutrition
Survey in 2002, which might be changed over the past decade.
Moreover, the PEFs and SF values were calculated on the basis of
results of animal experiment, which might not be applicable to
human exactly (Wu et al., 2011).