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Table 6 Classification statistics for simulations compared to experimental results

From: Manual wheelchair downhill stability: an analysis of factors affecting tip probability

 

Tip category

Forward tip

Backward tip

Rolled over

Stopped

Prevalence

0.190

0.058

0.444

0.307

Sensitivity

0.778

0.818

0.929

0.914

Specificity

0.980

0.972

0.952

0.939

PPV

0.903

0.643

0.940

0.869

NPV

0.949

0.989

0.943

0.961

F1 score

0.836

0.720

0.934

0.891

  1. Rolling over the bump was the most common scenario, followed by being stopped by the bump. The F1 score was greatest for rolling over the bump, and least accurate for backward tips