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%