Neurotic disorders

Notesontablesandfigures
I Tables showingpercentages
3. Significant differences
The row or column percentages may add to 99% or The bases for some sub-groups presented in the
101% because of rounding, tables were small such that the standard errors
around estimates for these groups are biased.
The varying positions of the percentage signs and Confidence intervals which take account of these
bases in the tables denote the presentation of
biased standard errors were calculated and,
different types of information. Where there is a although they are not presented in the tables, they
percentage sign at the head of a column and the were used in testing for statistically significant
base at the foot, the whole distribution is presented differences.
and the individual percentages add to between 99%
and 101%. Where there is no percentage sign in the 4. Tables showing Odds Ratios
table and a note above the figures, the figures refer
to the proportion of people who had the attribute In the analysis for this report, odds ratios were
being discussed, and the complementary propor- calculated when logistic regression was carried out.
tion, to add to 100%0,is not shown in the table. The logistic regression identified, from a range of
variable's, those which were independently related
The following conventions have been used within to specific symptoms/disorders/events. Odds ratios
tables:
(ORs) were produced only for those variables where
no cases
a significant relationship was identified. More
0 values lessthan 0.5% information about the logistic regression model
.. data not available used is included in Appendix D of the main survey
report.
2 Small bases
Very small bases have been avoided wherever
possible because of the relatively high-sampling
errors that attach to small numbers. Often where
the numbers are not large enough to justify the use
of all categories, classifications have been condensed.
However, an item within a classification is
occasionally shown separately, even though the
base is small, because to combine it with another
large category would detract-from the value of the
larger category. In general, percentage distributions
are shown if the base is 30 or more. Where the base
is slightly lower, actual numbers are shown in
square brackets. For tables containing means or
medians, data are not provided for sub-groups for"
which the base is less than 30.
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