TABLE 2.
Mean hematocrit by quartiles of serum cholesterol measures in adult participants in NHANES 2005–2008
| NHANES Survey 2005–2006 (N = 4,469) | NHANES Survey 2007–2008 (N = 5,318) | |||
| Hematocrit Mean (%) | 95% CI | Hematocrit Mean (%) | 95% CI | |
| HDL-C (mg/dl) | ||||
| Unadjusteda | ||||
| Low | 44.37 | 43.98, 44.76 | 42.77 | 42.34, 43.21 |
| Medium | 43.00 | 42.45, 43.56 | 42.06 | 41.55, 42.58 |
| High | 42.15 | 41.64, 42.65 | 41.24 | 40.55, 41.93 |
| Very high | 41.39 | 40.82, 41.95 | 40.09 | 39.40, 40.78 |
| Trend P value | <0.001 | <0.001 | ||
| Adjustedb | ||||
| Low | 42.85 | 42.45, 43.25 | 41.56 | 41.15, 41.97 |
| Medium | 42.57 | 41.98, 43.15 | 41.74 | 41.19, 42.30 |
| High | 42.83 | 42.27, 43.39 | 41.67 | 41.12, 42.22 |
| Very high | 42.54 | 42.08, 43.01 | 41.58 | 41.01, 42.16 |
| Trend P value | 0.212 | 0.962 | ||
| Non-HDL-C (mg/dl) | ||||
| Unadjusteda | ||||
| Low | 41.82 | 41.27, 42.37 | 40.56 | 40.10, 41.01 |
| Medium | 42.32 | 41.74, 42.91 | 41.38 | 40.69, 42.07 |
| High | 42.87 | 42.39, 43.35 | 41.87 | 41.15, 42.59 |
| Very high | 43.66 | 43.23, 44.09 | 42.64 | 42.29, 42.99 |
| Trend P value | <0.001 | <0.001 | ||
| Adjustedb | ||||
| Low | 42.12 | 41.57, 42.67 | 40.80 | 40.42, 41.18 |
| Medium | 42.42 | 41.90, 42.95 | 41.51 | 40.85, 42.18 |
| High | 42.88 | 42.40, 43.36 | 41.83 | 41.27, 42.39 |
| Very high | 43.32 | 42.82, 43.82 | 42.36 | 41.91, 42.81 |
| Trend P value | <0.001 | <0.001 | ||
Cholesterol quartiles were determined from NHANES 2005–2006 and are as follows: HDL-C [low (≤41.83 mg/dl), medium (>41.83–51.38 mg/dl), high (>51.38–62.93 mg/dl), and very high (>62.93 mg/dl)]; and non-HDL-C [low (≤114.42 mg/dl), medium (>114.42–140.1 mg/dl), high (>140.1–168.28 mg/dl), and very high (>168.28 mg/dl)]. CI, confidence interval.
a
Unadjusted model.
b
Adjusted for age, race/ethnicity, gender, smoking, and BMI.