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Table 2 The calculated population biochemical reference values for participants screened for the elderly study

From: Biochemistry reference intervals for healthy elderly population in Asmara, Eritrea

Analyte All N Mean 95% CI for mean Median Range 2.5th–97.5th percentile P value (gender)
Total cholesterol (T-Chol) (mg/dL) Combined 244 193 187–198 190.0 301–348 116–298 0.342
Male 116 189.0 181–197 186.5 47–326 100–310
Female 128 196.0 188–203 192.0 118–348 130.0–296.0
High density lipoprotein (HDL) (mg/dL) Combined 244 50.0 48–51.2 48.0 30–133.0 31.1–80.0 0.605
Male 115 50 47–52 48.0 30–133 41.0–80.0
Female 129 50.0 48–52 48.0 30–90.0 33.0–81.0
Sodium (Na) (mmol/L) Combined 245 140.5 140–141 140.0 131–156 135–147 0.000
Male 116 140.0 139–140 139.0 131–149 135–145
Female 129 141.0 140–142 141.0 133–156 134–148
Chloride (Cl) (mmol/L) Combined 244 107 106.5–107 107 99–122 101–113 0.020
Male 116 106 106–107 106 99.0–114 101–113
Female 128 107.4 107–108 107 99–122 100–113.5
Potassium (K) (mmol/L) Combined 245 4.3 4.3–4.4 4.30 3.3–5.90 3.61–5.30 0.426
Male 116 4.4 4.27–4.4 4.30 3.3–5.70 3.7–5.51
Female 129 4.30 4.2–4.4 4.30 3.5–5.9 3.6–5.30
Anion gap (μLU/mL) Combined 235 8.2 4.1–9.0 9.0 − 24 to 25 7–21 0.000
Male 108 5.7 4.1–7.3 8.0 0–17.0 0–15.6
Female 127 10.3 9.5–11.0 10.0 1.0–25.0 1.4–22.0
Carbon dioxide (CO2) (mmol/L) Combined 238 26.0 25–27 25.0 11–58.0 18–37.0 0.004
Male 109 28.0 26–29 25.0 11.0–58.0 17.0–38.0
Female 129 24.0 23.7–24.8 24.0 16.0–34.0 18.2–32.5
Albumin (Alb) (g/dL) Combined 245 4.68 4.6–4.7 4.7 2.1–5.5 4–5.30 0.000
Male 116 4.57 4.7–4.8 4.6 3.5–5.30 3.9–5.2
Female 129 4.80 4.7–4.8 4.8 3.4–5.5 4.1–5.5