Figure 5.

Confusion matrices of age classification computed with 10-fold cross-validation. Each column presents the sensor position (left to right): left ankle, lower back, chest and right wrist. 6D accelerations and angular velocities (50 features) were used for classification. $C_A^1$: age <40; $C_A^2$: 40 ≤ age < 50; $C_A^3$: age $\ge 50$.