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Table 1 Use of alternative entry screening approaches and intervals between official confirmation of first imported pandemic influenza A (H1N1) case and official confirmation of first untraceable local case for 26 nations with more than 100 confirmed cases by July 6, 2009.

From: Entry screening to delay local transmission of 2009 pandemic influenza A (H1N1)

Screening approaches used n (%) Median interval, days (inter-quartile range) Mean interval, days Mean difference in intervals compared to no screening (95% CI)*
No screening 5 (19%) 22 (0, 22) 14  
1- Medical checks before disembarkation 2 (8%) 21 (14, 28) 21 7 (-14, 30)
2- Health declaration forms 11 (42%) 22 (13, 34) 23 9 (-4, 24)
3- Symptom screening 13 (50%) 33 (7, 41) 26 12 (-2, 27)
4- Thermal scanners 13 (50%) 22 (7, 33) 21 7 (-6, 23)
2 OR 3 OR 4 21 (81%) 22 (7, 35) 23 9 (-3, 22)
2 AND 3 AND 4 6 (23%) 23 (9, 35) 22 7 (-9, 25)
  1. *95% confidence intervals estimated by bootstrapping with 1,000 resamples.