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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%