Table 3

The cutoff points for quartile distributions of controls for plasma carotenods, retinol, and tocopherols, as well as dietary nutrients

MeasuresCut-off points
25%50%75%
Plasma levels (μmol/l)
 Lycopene0.1787000.2751500.400980
 Zeaxanthin0.0309900.0528530.083088
 α-Carotene0.0345470.0586540.106860
 β-Carotene0.1242100.1747800.341080
 Lutein0.0839940.1324800.194740
 β-Cryptoxanthin0.0449620.0703300.132610
 Retinol0.9394901.3128602.026660
 α-Tocopherol11.2329016.8976027.00730
 γ-Tocopherol1.8731902.7175803.991640
Dietary level
 Vitamin A (IU)6153.508666.2513781.58
 Pro-A Carotene (μg)2914.594108.447028.67
 α-Carotene (μg)385.765699.2931142.31
 β-Carotene (μg)2381.233495.325851.36
 Lycopene (μg)1458.212370.583450.01
 Lutein (μg)1009.781666.752916.75
 Cryptoxanthin (μg)23.051671.1566120.847
 Retinol (μg)255.976384.817646.468
 Vitamin B1 (mg)0.785111.048041.40824
 Vitamin B2 (mg)0.843941.230721.66504
 Vitamin B6 (mg)0.948571.211741.66276
 Vitamin C (mg)85.3116127.444187.508
 Vitamin E (a-TE)a5.151996.792959.49193
 Folate (μg)170.557251.965354.408
 Niacin (mg)10.353514.390818.9274
 Fiber (g)7.8996510.222713.7164
  • a a-TE, α-Tocopherol Equivalents.