Table 2.

Sample characteristics across ferritin categories in Chinese adults (n = 8564)

Ferritin (ng/mL)a)	Q1 (low)	Q2	Q3	Q4 (high)	p for trendb)
Age (year)c)	44.11 ± 0.32	52.01 ± 0.32	53.71 ± 0.32	52.95 ± 0.32	<0.0001
BMI (kg/m2)	22.75 ± 0.07	23.17 ± 0.08	23.32 ± 0.08	24.20 ± 0.08	<0.0001
WC (cm)	79.13 ± 0.22	82.23 ± 0.22	83.23 ± 0.22	86.28 ± 0.22	<0.0001
TG (mmol/L)	1.25 ± 0.03	1.40 ± 0.03	1.56 ± 0.03	2.12 ± 0.03	<0.0001
TC (mmol/L)	4.64 ± 0.02	4.84 ± 0.02	4.89 ± 0.02	5.08 ± 0.02	<0.0001
LDL-c (mmol/L)	2.81 ± 0.02	3.01 ± 0.02	3.04 ± 0.02	3.05 ± 0.02	< 0.0001
HDL-c (mmol/L)	1.49 ± 0.01	1.48 ± 0.01	1.42 ± 0.01	1.36 ± 0.01	<0.0001
Transferrin (g/L)	3.16 ± 0.01	2.82 ± 0.01	2.75 ± 0.01	2.78 ± 0.01	<0.0001
Ferritin (ng/mL)	29.60 ± 3.02	64.96 ± 3.02	110.99 ± 3.02	343.89 ± 3.02	<0.0001
Insulin (μIU/mL)	12.91 ± 0.48	14.12 ± 0.48	14.62 ± 0.48	16.03 ± 0.48	<0.0001
Glucose (mmol/L)	5.07 ± 0.03	5.26 ± 0.03	5.40 ± 0.03	5.88 ± 0.03	<0.0001
Homa-IR	3.09 ± 0.15	3.53 ± 0.15	3.77 ± 0.15	4.66 ± 0.15	<0.0001
Homa-β	150.66 ± 70.92	324.22 ± 70.80	171.70 ± 70.83	227.38 ± 70.83	0.3085

^a)Data are means ± SE.

^b)p values were calculated using general linear model after adjustment for age, sex, region, smoking, drinking, dietary factors (total energy intake, fat intake, and protein).

^c)Not adjusted for itself.