TABLE 4.

Mean erythrocyte count 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)
	RBC Mean (million/ul)	95% CI	RBC Mean (million/ul)	95% CI
HDL-C (mg/dl)
Unadjusteda
Low	4.99	4.94, 5.03	4.87	4.84, 4.91
Medium	4.81	4.75, 4.87	4.77	4.72, 4.82
High	4.68	4.64, 4.73	4.64	4.58, 4.71
Very high	4.52	4.47, 4.57	4.49	4.42, 4.56
Trend P value	<0.001		<0.001
Adjustedb
Low	4.83	4.79, 4.87	4.74	4.71, 4.77
Medium	4.76	4.70, 4.82	4.73	4.68, 4.79
High	4.74	4.70, 4.79	4.69	4.64, 4.74
Very high	4.65	4.60, 4.69	4.66	4.59, 4.72
Trend P value	<0.001		0.002
Non-HDL-C (mg/dl)
Unadjusteda
Low	4.64	4.60, 4.69	4.57	4.52, 4.62
Medium	4.69	4.63, 4.76	4.68	4.62, 4.75
High	4.78	4.73, 4.82	4.74	4.67, 4.82
Very high	4.85	4.81, 4.89	4.82	4.79, 4.85
Trend P value	<0.001		<0.001
Adjustedb
Low	4.67	4.62, 4.72	4.60	4.56, 4.64
Medium	4.70	4.64, 4.76	4.70	4.63, 4.76
High	4.78	4.74, 4.82	4.74	4.68, 4.79
Very high	4.81	4.77, 4.86	4.79	4.76, 4.83
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 nonHDL-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.

^aUnadjusted model.

^bAdjusted for age, race/ethnicity, gender, smoking, and BMI.