Table 1.
Characteristics of the study population in Hb tertiles.
| Variable | Low Hb tertile | Medium Hb tertile | High Hb tertile | p Value |
|---|---|---|---|---|
| Hb (g/dL) | 132.3 (9.1) | 139.9 (8.1) | 151.0 (8.6) | <.001 |
| Number of subjects (n) | 212 | 210 | 213 | |
| Number of males (n) | 96 | 86 | 107 | .159 |
| Current smokers (n) | 47 | 44 | 49 | .890 |
| Insufficient sleep (n) | 65 | 67 | 59 | .670 |
| Sitting time ≥11 h/d (n) | 27 | 40 | 27 | .105 |
| Bp medication (n) | 28 | 25 | 20 | .455 |
| Lipid medication (n) | 2 | 6 | 5 | .355 |
| Alcohol consumption (g/d) | 9.8 (17.1) | 10.6 (17.3) | 11.4 (19.8) | .649 |
| MVPA (min/d) | 73.1 (33.0) | 70.1 (36.1) | 71.3 (32.8) | .673 |
| Height (cm) | 171.4 (8.9) | 171.1 (9.3) | 172.1 (8.5) | .490 |
| Weight (kg) | 73.3 (12.3) | 75.0 (14.0) | 81.2 (14.5) | <.001 |
| BMI (kg/m2) | 24.8 (3.0) | 25.5 (3.8) | 27.4 (4.3) | <.001 |
| WH ratio | 0.89 (0.07) | 0.89 (0.08) | 0.91 (0.08) | <.001 |
| Sbp mean (mmHg) | 120.9 (13.5) | 122.4 (14.2) | 126.5 (17.6) | <.001 |
| Dbp mean (mmHg) | 80.5 (9.2) | 82.7 (9.8) | 85.1 (10.6) | <.001 |
| MAP (mmHg) | 94.0 (10.3) | 95.9 (10.9) | 98.9 (12.5) | <.001 |
| fB-glucose (mmol/L) | 5.3 (0.5) | 5.3 (0.4) | 5.4 (0.5) | <.001 |
| HOMA-IR | 1.44 (1.23) | 1.59 (1.54) | 2.2 (1.71) | <.001 |
| Total cholesterol (mmol/L) | 5.3 (0.9) | 5.3 (0.9) | 5.4 (0.9) | .210 |
| HDL cholesterol (mmol/L) | 1.60 (0.37) | 1.59 (0.38) | 1.49 (0.34) | .004 |
| LDL cholesterol (mmol/L) | 3.3 (0.9) | 3.4 (0.9) | 3.6 (0.9) | .004 |
| Triglycerides (mmol/L) | 0.95 (0.54) | 1.01 (0.67) | 1.08 (0.72) | <.001 |
| Hematocrit (%) | 0.40 (0.02) | 0.42 (0.02) | 0.44 (0.02) | <.001 |
| RBC count (×1012/L) | 4.4 (0.3) | 4.6 (0.3) | 4.9 (0.3) | <.001 |
| MCV (fL) | 89.6 (3.8) | 90.0 (3.4) | 90.4 (3.5) | .072 |
| MCH (pg) | 30.0 (1.5) | 30.3 (1.3) | 30.8 (1.2) | <.001 |
| MCHC (g/dL) | 334 (8) | 337 (7) | 340 (7) | <.001 |
| RDW (%) | 13.4 (0.8) | 13.1 (0.6) | 13.1 (0.6) | <.001 |
| B-platelets (×109/L) | 254 (55) | 248 (56) | 248 (49) | .470 |
| B-leucocytes (×109/L) | 5.0 (1.22) | 5.3 (1.2) | 5.6 (1.5) | <.001 |
| B-neutrophils (×109/L) | 2.8 (1.0) | 2.9 (0.9) | 3.2 (1.1) | <.001 |
| B-lymphocytes (×109/L) | 1.6 (0.5) | 1.7 (0.5) | 1.8 (0.49) | .001 |
| B-monocytes (×109/L) | 0.45 (0.13) | 0.46 (0.17) | 0.50 (0.17) | .001 |
| B-eosinophils (×109/L) | 0.19 (0.13) | 0.20 (0.13) | 0.20 (0.14) | .771 |
| B-basophils (×109/L) | 0.03 (0.02) | 0.03 (0.02) | 0.03 (0.02) | .260 |
Hb: haemoglobin; bp: blood pressure; MVPA: moderate to vigorous physical activity; BMI: body mass index; WH: waist–hip; Sbp: systolic blood pressure; Dbp: diastolic blood pressure; MAP: mean arterial pressure; fB-glucose: fasting blood glucose; HOMA-IR: homeostatic model assessment for insulin resistance; HDL: high-density lipoprotein; LDL: low-density lipoprotein; RBC: red blood cell; MCV: mean cellular volume; MCH: mean cellular haemoglobin; MCHC: mean cellular haemoglobin concentration; RDW: red cell distribution width; B: blood.
The values indicate exact numbers of study subjects, mean (SD, standard deviation) or median (inter quartile range). p is given for statistical comparison of low and High Hb tertiles. Number of participants (n) in the statistical analyses.