Serum 25(OH)D Level and Parathyroid Hormone in Chinese Adult Population: A Cross-Sectional Study in Guiyang Urban Community from Southeast of China

Table 2

Differences in the mean values of BMI, Serum 25(OH)D, PTH, calcium, Phosphorus, and Creatinine in different age groups (𝑛=1510).

Parameter	Youth (𝑛=618)			Middle age (𝑛=613)			Senior (𝑛=279)
	Total sample	Men	Women	Total sample	Men	Women	Total sample	Men	Women
Age (yr)	30.8 ± 5.7	30.4 ± 5.5	31.1 ± 5.8	49.2 ± 5.5	49.2 ± 5.8	49.2 ± 5.8	68.1 ± 4.5	68.9 ± 4.2	67.5 ± 4.6
BMI (kg/m^2)	22.5 ± 3.6	23.5 ± 3.6	21.7 ± 3.4	24.3 ± 3.3	24.5 ± 3.1	24.2 ± 3.4	25.0 ± 3.4	24.6 ± 2.9	25.4 ± 3.6
25(OH)D (ng/mL)	18.2 ± 9.2^a	17.6 ± 9.5^a	18.7 ± 9.0	22.8 ± 8.7	23.4 ± 8.5	22.4 ± 8.1	19.9 ± 7.8^a	22.2 ± 8.4	18.2 ± 6.9^b
iPTH (pg/mL)	33.0 ± 13.2^a	32.3 ± 12.3	33.5 ± 13.8	30.8 ± 13.3	35.0 ± 13.9	27.9 ± 12.1^b	32.8 ± 15.2^a	35.6 ± 14.1	30.8 ± 15.7^b
Total calcium (mmol/mL)	2.4 ± 0.1	2.4 ± 0.1	2.4 ± 0.1	2.4 ± 0.2	2.4 ± 0.1	2.4 ± 0.2	2.4 ± 0.2	2.4 ± 0.2	2.4 ± 0.2
Phosphate (mmol/mL)	1.1 ± 0.2	1.1 ± 0.2	1.1 ± 0.1	1.1 ± 0.2	1.0 ± 0.2	1.1 ± 0.1^b	1.0 ± 0.2	1.0 ± 0.1	1.1 ± 0.1^b
Creatinine (umol/L)	67.1 ± 14.1	69.3 ± 11.5	66.5 ± 14.7	73.8 ± 10.4	74.2 ± 12.3	71.9 ± 11.1	76.6 ± 13.1^c	78.4 ± 11.5	74.7 ± 10.6

Values are presented as mean ± SD. For conversion of 25(OH)D from nmol/liter to ng/mL, divide by 2.496; for conversion of PTH from pmol/liter to pg/mL, multiply by 11.1. Distribution of PTH was skewed. Median (interquartile range) are presented; serum 25(OH)D was assessed in a sample (𝑛=1494) and iPTH (𝑛=1414). ^a𝑃<0.01, as compared to the middle age category, ^b𝑃<0.01, as compared to men, ^c𝑃<0.01, as compared to youth category.