Table 2.
Differences in plasma pyridoxal 5’-phosphate (PLP) concentration in 202 healthy young adult women by categories of demographic and lifestyle factors.
| Variables | Plasma PLP concentration | ||||
|---|---|---|---|---|---|
| Subjects n | Mean (95% CI) nmol/L | <20 nmol/L n (%) * | 20–30 nmol/L n (%) * | >30 nmol/L n (%) | |
| Overall | 202 | 61.0 (55.2, 67.3) | 3 (1.5) | 22 (11) | 177 (88) |
| Anemia | |||||
| Hb > 12 g/dL | 166 | 62.0 (55.5, 69.2) | 3 (1.8) | 17 (10) | 146 (88) |
| Hb < 12 g/dL | 36 | 56.4 (45.0, 70.8) | 0 | 5 (14) | 31 (86) |
| Ethnicity | |||||
| European ‡ | 147 | 66.9 (59.2, 75.6) † | 2 (1.4) | 14 (10) | 131 (89) |
| South Asian | 55 | 47.6 (41.2, 54.8) | 1 (1.8) | 8 (15) | 46 (84) |
| Education | |||||
| Low | 7 | 57.7 (28.5, 116.9) | 0 | 2 (29) | 5 (71) |
| High | 195 | 61.1 (55.3, 67.5) | 3 (1.5) | 20 (10) | 172 (88) |
| Household income | |||||
| Low | 80 | 59.5 (52.1, 68.0) | 1 (1.3) | 7 (9) | 72 (90) |
| High | 103 | 63.6 (55.3, 73.0) | 2 (1.9) | 15 (13) | 86 (83) |
| Physical activity level | |||||
| Low | 8 | 44.4 (37.8, 52.3) | 0 | 0 | 8 (100) |
| Medium | 110 | 60.6 (53.0, 69.4) | 2 (1.8) | 13 (12) | 95 (86) |
| High | 82 | 63.8 (54.5, 74.8) | 1 (1.2) | 9 (11) | 72 (88) |
| Oral contraceptive use | |||||
| Non-user | 144 | 59.9 (53.5, 67.1) | 2 (1.4) | 17 (12) | 125 (87) |
| User | 58 | 63.6 (52.0, 77.8) | 1 (1.7) | 5 (9) | 52 (90) |
| Supplemental vitamin B6 use | |||||
| Non-user ‡ | 146 | 48.5 (45.0, 52.3) | 3 (2.1) | 18 (12) | 125 (86) |
| User | 56 | 111.5 (87.2, 139.9) † | 0 | 4 (7) | 52 (93) |
| Smoker | |||||
| No | 174 | 61.1 (55.0, 67.8) | 2 (1.2) | 18 (10) | 154 (89) |
| Yes | 28 | 60.2 (44.0, 82.3) | 1 (3.6) | 4 (14) | 23 (82) |
Plasma PLP concentration was presented as geometric mean (95% confidence interval (CI)) and was log-transformed to carry out the following statistical analyses. Hb, hemoglobin. * Chi-squared test revealed no significant difference in the prevalence of B6 deficiency and suboptimal B6 status in all the variables. † p value < 0.05 for two-sample t test comparing the indicated category with the referent category. ‡ Referent category.