Statistical analysis
All statistical analyses were performed with the SPSS
V.9 computer program. Continuous, normally distributed
data were compared using t tests for independent groups.
Scores for each dimension of the SF-36 were transformed
according to the SF-36 user’s guide to a scale of 0-100
(100 = best possible score). These values were then
compared to the Australian population norms derived by
the Australian Bureau of Statistics from the 1995 National
Health Survey. Where data were not normally distributed,
logarithmic transformations were performed prior to
analysis. Comparisons of proportions were undertaken
using the z test. In all cases p values