Table 5 Threshold effect analysis of serum carotenoids on LAP using piece-wise linear regression
LAP | Adjusted β (95% CI) P value | |
|---|---|---|
α-carotene | ||
Inflection point (K) | −0.51 | |
<K slope | −15.17 (− 24.33, − 6.02) 0.0012 | |
>K slope | −4.94 (− 6.30, − 3.58) < 0.0001 | |
Log likelihood ratio test | 0.038 | |
β-carotene | ||
Inflection point (K) | 2.93 | |
<K slope | −13.56 (− 17.46, − 9.67) < 0.0001 | |
>K slope | −6.52 (− 8.31, − 4.74) < 0.0001 | |
Log likelihood ratio test | 0.004 | |
β-cryptoxanthin | ||
One line slop | −4.95 (− 6.57, − 3.34) < 0.0001 | |
Log likelihood ratio test | 0.253 | |
Lutein/zeaxanthin | ||
One line slop | −4.03 (− 6.38, − 1.69) 0.0008 | |
Log likelihood ratio test | 0.367 | |
Trans-lycopene | ||
Inflection point (K) | 4.29 | |
<K slope | −2.66 (− 5.45, 0.13) 0.0613 | |
>K slope | −12.00 (− 16.38, − 7.63) < 0.0001 | |
Log likelihood ratio test | 0.002 |