Table 4 Two-piecewise regression analysis of the effect of dietary fibre intake on the progression of attachment loss
Attachment loss progression | Adjusted β (95% CI), P value |
|---|---|
Fitting by the standard linear model | -0.0009 (-0.0014, -0.0005) < 0.0001 |
Fitting by the two-piecewise linear model | |
 Inflection point | 753.4 mg |
 Dietary fibre < 753.4 (mg) | -0.0016 (-0.0021, -0.0010) < 0.0001 |
 Dietary fibre > 753.4 (mg) | 0.0015 (0.0001, 0.0029) 0.0362 |
 Log likelihood ratio |  < 0.001 |