Fig. 2

Change in FAP level from baseline to TP12. The change in FAP level was 32.69 dB/m in the intervention group and 17.05 dB/m in the control group. The covariance model showed that the intervention group was significantly better than the control group in reducing the FAP level (LS mean difference: 16.07 [95% CI: 8.90–23.25] dB/m, p < 0.001)