Data on risk factors and health-related behaviours are generally drawn from household surveys. It
is important to note that the reliability of these estimates depends upon the overall quality of the
sampling frames and methods used; on interviewer training, data-quality assurance procedures,
117
Table 5
and statistical data analyses; and on the ability and willingness of respondents to provide accurate
responses. Where data from household surveys are not available, statistical techniques may be used
to develop estimates.