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Table 10 Minimum required sample size as a function of standard error (SE) with 95% confidence interval.

From: New non-randomised model to assess the prevalence of discriminating behaviour: a pilot study on mephedrone

Standard error (SE) Percentage points (1.96SE) Minimum n
(0.05) ±0.0980 178
(0.04) ±0.0784 278
(0.03) ±0.0588 494
(0.02) ±0.0392 1112
(0.01) ±0.0196 4445