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Table 6 Confusion matrices for the recognition of the activities along with the corresponding validation metrics for the five classifiers expressed in percent

From: Improving activity recognition using a wearable barometric pressure sensor in mobility-impaired stroke patients

   Classification       
   Lying Sitting Standing Walking SEN SPE PPV NPV F-score CCR
   H-FIS
Reference Lying 1022 37 2.8 12.2 95.2 99.7 94.5 99.8 % 94.8 (96.9 ± 5.0) 90.4 (91.4 ± 6.6)
Sitting 37.3 11975 737.1 286.1 91.9 95.5 96.0 90.8 % 93.9 (95.7 ± 8.4)
Standing 22.2 245.3 2066 228.9 80.6 94.3 62.7 97.6 % 70.5 (71.4 ± 11.3)
Walking 0 211 490.9 6667.5 90.5 96.8 92.7 95.8 % 91.6 (91.0 ± 6.0)
   FIS-IMUBP
Reference Lying 1022 21.1 17.1 13.8 95.2 99.7 94.5 99.8 % 94.8 (96.9 ± 5.0) 89.4 (89.8 ± 5.9)
Sitting 37.3 11729.9 940.9 327.4 90.0 95.4 95.9 88.9 % 92.8 (93.6 ± 7.0)
Standing 22.2 249.8 2060.6 229.8 80.4 93.4 59.2 97.6 % 68.2 (68.2 ± 14.7)
Walking 0 230.1 461.7 6677.6 90.6 96.6 92.1 95.9 % 91.4 (91.0 ± 6.0)
   Event-FIS
Reference Lying 1022 33.4 4.8 13.8 95.2 99.7 94.5 99.8 % 94.8 (96.9 ± 5.0) 81.9 (84.4 ± 12.0)
Sitting 37.3 9829.6 2841.2 327.4 75.4 96.9 96.7 76.9 % 84.7 (86.4 ± 29.5)
Standing 22.2 139.3 2171.1 229.8 84.7 84.3 39.2 97.9 % 53.6 (65.8 ± 36.7)
Walking 0 167.9 523.9 6677.6 90.6 96.6 92.1 95.9 % 91.4 (91.0 ± 6.0)
   FIS-IMU
Reference Lying 1022 6.1 32.1 13.8 95.2 99.7 94.5 99.8 % 94.8 (96.9 ± 5.0) 87.1 (86.8 ± 6.2)
Sitting 37.3 11231.1 1439.7 327.4 86.2 95.4 95.7 85.3 % 90.7 (90.2 ± 8.0)
Standing 22.2 301.7 2008.7 229.8 78.4 90.9 50.6 97.2 % 61.5 (62.4 ± 23.0)
Walking 0 201.9 489.9 6677.6 90.6 96.6 92.1 95.9 % 91.4 (91.0 ± 6.0)
   EPOCH
Reference Lying 892 120 28 24 83.8 99.3 84.5 99.3 % 84.2 (90.7 ± 12.4) 84.8 (84.0 ± 5.4)
Sitting 124 11980 608 484 90.8 83.1 86.5 88.3 % 88.6 (88.3 ± 10.6)
Standing 40 1264 908 348 35.5 96.3 53.0 92.7 % 42.5 (39.6 ± 15.9)
Walking 0 484 168 6752 91.2 94.9 88.7 96.1 % 90.0 (91.3 ± 6.0)
  1. Each confusion matrix is expressed in seconds
  2. For the CCR and the F-score, the median and interquartile range are provided (computed across patients)
  3. SEN Sensitivity, SPE Specificity, PPV Positive Predictive Value, NPV Negative Predictive Value, CCR Correct Classification Rate