TABLE 3.
Dietary intakes and biomarkers of vitamin B-6 and riboflavin in younger and older adults1
| Age category | ||||
|---|---|---|---|---|
| 18–50 y (n = 628) | 51–64 y (n = 184) | ≥65 y (n = 124) | P 2 | |
| General characteristics | ||||
| Male, % | 52 | 54 | 46 | 0.363 |
| Age, y | 34 (10)a | 57 (4)b | 72 (5)c | <0.001 |
| BMI, kg/m2 | 26.3 (4.4)a | 29.4 (5.1)b | 27.7 (4.0)c | <0.001 |
| Energy intake, MJ/d | ||||
| Males | 10.5 (2.7)a | 9.4 (2.5)b | 8.1 (2.5)c | <0.001 |
| Females | 7.4 (2.2)a | 7.1 (1.7)a,b | 6.5 (1.5)b | 0.024 |
| Vitamin B-6 | ||||
| Intake, mg/d | ||||
| Males | 3.2 (1.1) | 3.0 (1.1) | 2.9 (1.4) | 0.112 |
| Females | 2.1 (0.8) | 2.2 (0.8) | 2.3 (0.9) | 0.430 |
| Biomarker status (plasma PLP), nmol/L | ||||
| Males | 105.8 (45.3)a | 95.5 (44.2)a | 74.3 (36.0)b | <0.001 |
| Females | 74.6 (35.3) | 78.6 (43.1) | 72.1 (44.4) | 0.377 |
| Riboflavin | ||||
| Intake, mg/d | ||||
| Males | 2.3 (1.0)a | 2.0 (0.8)b | 1.8 (0.7)b | <0.001 |
| Females | 1.6 (0.6) | 1.6 (0.5) | 1.6 (0.7) | 0.393 |
| Biomarker status (EGRac) | ||||
| Males | 1.38 (0.17) | 1.35 (0.17) | 1.34 (0.15) | 0.105 |
| Females | 1.41 (0.17)a | 1.38 (0.16)a, b | 1.34 (0.16)b | 0.003 |
Values are means (SDs) unless otherwise stated. Data available for NANS cohort n = 936, whereby corresponding biomarker and dietary data were available for unsupplemented adults. Values in a row without a common superscript letter are significantly different, P < 0.05 (Scheffé post hoc test). EGRac, erythrocyte glutathione reductase activation coefficient; PLP, pyridoxal 5´-phosphate.
General characteristics were compared between groups by using chi-square analysis and 1-factor ANOVA (Scheffé post hoc tests) for categorical and continuous variables, respectively. Differences in riboflavin and vitamin B-6 intake and biomarker status were analyzed by 1-factor ANOVA with Scheffé post hoc tests.