Table 3.

Measures of validity across four data cleaning methods with Method 5 (video verification) as the criterion

Method compared to method 5 (Video-verification)	Sensitivity	Specificity	Positive predictive value (PPV)
1 (Uncleaned)	1.00	0.00	0.03
2 (time-windowed HAEs only)	1.00	0.60	0.07
3 (algorithm-classified HAEs without time windowing)	0.37	0.97	0.26
4 (algorithm-classified HAEs with time windowing)	0.37	0.96	0.39
6 (HAEs confirmed by both proprietary classification algorithm and video verification)	1.00	N/A	1.00

Sensitivity, specificity and positive predictive value (PPV) are presented for methods one through six. Method 5 (video-verification) is used as the reference criteria