Notes to Tables
1. The following conventions have been used in tables:
n/a no data collected
- no observations (zero value)
0 non-zero values of less than 0.5% and thus rounded to zero
[ ] normally used to warn of small sample bases, if the unweighted base is less than 50. (If a group's unweighted base is less than 30, data are normally not shown for that group.)
2. Because of rounding, row or column percentages may not add exactly to 100%.
3. A percentage may be quoted in the text for a single category that aggregates two or more of the percentages shown in a table. The percentage for the single category may, because of rounding, differ by one percentage point from the sum of the percentages in the table.
4. Values for means, medians, percentiles and standard errors are shown to an appropriate number of decimal places. Standard Errors may sometimes be abbreviated to SE for space reasons.
5. 'Missing values' occur for several reasons, including refusal or inability to answer a particular question; refusal to co-operate in an entire section of the survey (such as a self-completion questionnaire); and cases where the question is not applicable to the participant. In general, missing values have been omitted from all tables and analyses.
6. The population sub-group to whom each table refers is stated at the upper left corner of the table.
7. Both weighted and unweighted sample bases are shown at the foot of each table. The weighted numbers reflect the relative size of each group in the population, not numbers of interviews conducted, which are shown by the unweighted bases.
8. The term 'significant' refers to statistical significance (at the 95% level) and is not intended to imply substantive importance.
9. Within the report Figures have generally been produced using data rounded to the nearest whole number. There are a small number of Figures which show data to the nearest decimal place in order to aid interpretation.
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