Fig. 8From: Identification of milling status based on vibration signals using artificial intelligence in robot-assisted cervical laminectomyComparison of vibration signals amplitudes at different milling states and different frequencies. NS: There was no statistical significance (P > 0.05); *: was statistically significant (P < 0.05); **: was statistically significant (P < 0.01); and ***: was statistically significant (P < 0.001)Back to article page