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Table 2 Margin of error (95% confidence interval) according to sample size

From: Improving quality in population surveys of headache prevalence, burden and cost: key methodological considerations

Sample size (N)

200

500

1,000

2,000

5,000

10,000

Margin of error (%)

4.2

2.7

1.9

1.3

0.8

0.6

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The Journal of Headache and Pain

ISSN: 1129-2377

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