Table 2.
Dietary and total Vitamin B12 and Folate intake for diet groups (omnivores and vegetarians) for the combined NDNS years 2008-2019 in WCBA for the total population. Results are shown as mean (95%CI) for omnivores and vegetarians median (IQR) for skewed data
| Omnivores mean (95%CI) | Vegetarians mean (95%CI) | Survey-weighted t-tests (omnivore vs. vegetarian) | |
|---|---|---|---|
| Na | 2204 | 89 | |
| Dietary B12 intake (µg/day) | 4.3 (4.2–4.5) | 2.9 (2.5–3.3) | < 0.0001 |
| Total B12 intake (µg/day) | 3.9 (2.7–5.4) [median, IQR] | 3.2 (2.0–4.6) [median, IQR] | < 0.003 |
| N (%) B12 supplements | 215 (10%) | 24 (27%) | < 0.001 |
| B12 supplement intake only (µg/day) | 2.2 (1.0–6.4) [median, IQR] | 1.7 (1.0–5.4) [median, IQR] | 0.601 |
| Dietary folate intake (µg/day) | 206.9 (202.4–211.4) | 227.4 (210.1–244.7) | 0.025 |
| Total folate intake (µg/day) | 250.5 (233.9–267.1) | 271.4 (241.1–301.7) | < 0.001 |
| N (%) Folate supplements | 236 (11%) | 22 (25%) | < 0.001 |
| Folate supplement intake only (µg/day) | 386.5 (256.7, 516.3) | 213.2 (158.6, 267.8) | 0.105 |
ᵃTotal number of participants with dietary data. Number of participants per variable may differ due to missing data.
ᵇMedian (IQR) reported due to right-skewed distribution. Wilcoxon rank-sum test used for statistical comparison.
p-values: Survey-weighted t-tests used for normally distributed dietary intake variables. Wilcoxon rank-sum tests used for skewed variables (total B12 intake, supplement-only intakes). Chi-square tests used for proportions (supplement use). Significant p-values (< 0.05) are shown in bold.