Table 2.

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

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