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Table 2 Confidence intervals for a range of possible false negative rates in a sample of 500 screen negative children

From: The Magpie Trial follow up study: outcome after discharge from hospital for women and children recruited to a trial comparing magnesium sulphate with placebo for pre-eclampsia [ISRCTN86938761]

Observed false negative rate
(% of cases among screen negatives)
N = 500
(95% confidence interval)
5% 3.4% to 7.3%
2% 1.1% to 3.6%
1% 0.4% to 2.3%
0% 0% to 0.8%