Table 2 Weighted multivariable ordinal logistic regression analysis between RC levels (log-transformed) and age-stratified quartiles of the CERAD total score

Continuous, mmol/L

0.72(0.56–0.93)*

0.74(0.58–0.94)*

0.77(0.61–0.96)*

Categorical (quartiles)

≤0.39 mmol/L

Ref

Ref

Ref

0.39 to ≤ 0.54 mmol/L

0.87(0.67–1.13)

0.91(0.68–1.21)*

0.93(0.70–1.25)

0.54 to ≤ 0.78 mmol/L

0.56(0.40–0.80)**

0.62(0.44–0.88)**

0.64(0.47–0.88)**

 > 0.78 mmol/L

0.66(0.44–0.98)*

0.67(0.46–0.98)*

0.70(0.50–0.98)*

P for linear trend

0.040

0.015

0.013