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Table 5 Total positive predictive value (PPV) by year

From: Assessment of electronic disease early warning system for improved disease surveillance and outbreak response in Yemen

No

Indicators

2013

2014

2015

2016

2017

1

No. alerts

2075

4281

5321

39,624

126,555

2

No. true alerts

1561

3583

5046

28,476

120,637

3

positive predictive value (PPV)

75%

84%

95%

72%

95%

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BMC Public Health

ISSN: 1471-2458

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