Road Safety Education | Vocabulary Booklet
21
COMPARISON GROUP
A comparison group is a group
of participants who do not
receive the intervention being evaluated. A comparison group
differs to a control group in that individuals or groups are
not
randomly allocated. Allocation to the comparison (non-inter-
vention group) could
be done on an arbitrary basis, or through
more careful selection such as making sure an equal number
of males and females go into each group (intervention and
non-intervention).
CONTROL GROUP
A control group consists of those
participants who have been
randomly allocated to the non-intervention group. As they
have been
randomly allocated
they can be assumed to be
equivalent to the individuals in the intervention group. There-
fore any changes in the two groups
seen after the intervention
can be said to be caused by the intervention, and not simply
by individual differences between
those who received the
intervention, and those who did not.
BASELINE DATA/INFOR-
MATION
Baseline data or information is a measure of the current situa-
tion. It is the existing level of data or information (for example,
about behaviour,
knowledge, skills, attitudes or accidents)
before the intervention starts. This can be compared to the
same data at the end of the intervention (or a period of time
afterwards) in order to measure
the change achieved by the
intervention.
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