Section 2 of 6
The Question
The wording that decides the number. Every entry below names the definition or the source it depends on, and says where official figures disagree.

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4 entries in this section
- The wording decides the numberChange 'long-standing illness' to 'condition expected to last 12 months' and the count moves by millions.
- Filter questionsWhat gets asked first, and who is routed past the rest.
- Self-reportThe count depends on identification, which depends on the question.
- Comparability over timeWhy a series breaks when the question is improved.