Table 2. Changes in serobiochemical parameters in subjects consuming the purple-fleshed sweet potato beverage over a 4-week study period with a 2-week washout period.
| Day 1 | Day 15 | Day 29 | Day 43 | p-valuec | |
|---|---|---|---|---|---|
| RBC (tera/l) | 4.96 ± 0.29 | 4.93 ± 0.24 | 4.93 ± 0.28 | 4.88 ± 0.28 | 0.1567 |
| Platelets (giga/l) | 257 ± 56 | 260 ± 64 | 265 ± 56 | 266 ± 60 | 0.3403 |
| Reticulocytesa (%) | 1.01 ± 0.22 | 1.02 ± 0.15 | 1.00 ± 0.22 | 1.16 ± 0.21 | <0.0001 |
| Leucocytesa (giga/l) | 6.6 ± 1.4 | 7.0 ± 1.8 | 7.0 ± 1.5 | 6.6 ± 1.2 | 0.1465 |
| WBC: lymphocytesa (%) | 34.7 ± 6.1 | 32.3 ± 8.4 | 34.1 ± 7.9 | 35.5 ± 6.8 | 0.1489 |
| WBC: neutrophilsa (%) | 55.1 ± 7.3 | 58.2 ± 9.1 | 55.7 ± 9.4 | 54.3 ± 7.5 | 0.2037 |
| WBC: monocytes (%) | 5.8 ± 1.1 | 5.2 ± 0.8 | 5.6 ± 1.3 | 5.6 ± 1.3 | 0.0121 |
| WBC: eosinophilsa (%) | 3.4 ± 1.9 | 3.5 ± 1.6 | 3.6 ± 2.1 | 3.7 ± 2.1 | 0.7138 |
| WBC: basophils (%) | 0.9 ± 0.2 | 0.9 ± 0.3 | 1 ± 0.4 | 0.9 ± 0.2 | 0.4189 |
| MCV (fl) | 83.5 ± 2.9 | 84.7 ± 3.3 | 85.0 ± 3.3 | 84.9 ± 3.4 | <0.0001 |
| MCH (fmol) | 1.84 ± 0.08 | 1.83 ± 0.09 | 1.83 ± 0.09 | 1.83 ± 0.08 | 0.5769 |
| MCHC (mmol/l) | 22.02 ± 0.63 | 21.61 ± 0.66 | 21.57 ± 0.56 | 21.61 ± 0.63 | <0.0001 |
| Hematocrit (l/l) | 0.414 ± 0.028 | 0.417 ± 0.023 | 0.419 ± 0.027 | 0.414 ± 0.027 | 0.2885 |
| Hemoglobin (mmol/l) | 9.1 ± 0.7 | 9.0 ± 0.6 | 9.0 ± 0.7 | 9.0 ± 0.6 | 0.1253 |
| Glucose (mmol/l) | 6.1 ± 0.8 | 6.1 ± 0.9 | 6.1 ± 0.9 | 6.3 ± 0.9 | 0.0407 |
| Urea (mmol/l) | 5.9 ± 1.3 | 6.0 ± 1.2 | 5.7 ± 1.5 | 6.0 ± 0.9 | 0.629 |
| Albumin (g/l) | 46 ± 3 | 45 ± 3 | 44 ± 2 | 45 ± 2 | <0.0001 |
| Creatinine (μmol/l) | 89 ± 12 | 90 ± 13 | 90 ± 11 | 89 ± 12 | 0.9757 |
| Total bilirubina (μmol/l) | 11 ± 5 | 10 ± 3 | 10 ± 4 | 10 ± 4 | 0.3441 |
| Cholesterol (mmol/l) | 5.9 ± 0.7 | 5.8 ± 1.2 | 5.8 ± 1.0 | 5.9 ± 1.0 | 0.2233 |
| HDL-cholesterola (mmol/l) | 1.21 ± 0.26 | 1.19 ± 0.31 | 1.2 ± 0.28 | 1.23 ± 0.28 | 0.1739 |
| LDL-cholesterola (mmol/l) | 3.9 ± 0.7 | 3.9 ± 1.0 | 3.8 ± 1.0 | 3.9 ± 0.9 | 0.2342 |
| Triacylglyceridesb (mmol/l) | 1.7 ± 0.7 | 1.6 ± 0.6 | 1.6 ± 0.6 | 1.7 ± 0.7 | 0.902 |
| Insulina,b (mU/l) | 12.6 ± 8.5 | 13.8 ± 11.1 | 13.2 ± 9.1 | 13.0 ± 8.5 | 0.315 |
a Parameters for which outliers were found and removed.
b Statistical analysis based on log-transformed data.
c A p-value of less than 0.05 was considered to be statistically significant.
HDL: high-density lipoprotein; LDL: low-density lipoprotein; MCH: mean corpuscular hemoglobin; MCHC: mean corpuscular hemoglobin concentration; MCV: mean corpuscular volume; RBC: red blood cell; WBC: white blood cell.