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Table 1 General and clinical characteristics according to the quartiles of serum ferritin

From: Association between serum ferritin and hypertension according to the working type in Korean men: the fifth Korean National Health and nutrition examination survey 2010–2012

Variables Quartiles of serum ferritin (ng/mL)
Quartile 1 (≤ 66.82) Quartile 2 (66.83–100.78) Quartile 3 (100.79–149.13) Quartile 4 (> 149.13) P for trend
N 1111 1110 1111 1110  
Age (year) 43.87 (0.512) 42.10 (0.486) 42.34 (0.459) 42.31 (0.443) 0.025
SBP (mm Hg) 119.58 (0.503) 119.15 (0.553) 119.26 (0.545) 120.95 (0.522) 0.083
DBP (mm Hg) 78.96 (0.411) 79.41 (0.422) 79.65 (0.392) 81.58 (0.400) < 0.001
WC (cm) 82.29 (0.311) 83.97 (0.376) 84.11 (0.338) 86.05 (0.377) < 0.001
BMI (kg/m2) 23.56 (0.106) 24.14 (0.132) 24.20 (0.116) 24.82 (0.141) < 0.001
FBS (mg/dL) 95.48 (0.613) 96.63 (0.673) 98.33 (0.893) 101.28 (0.878) < 0.001
TC (mg/dL) 184.81 (1.204) 188.77 (1.180) 191.67 (1.301) 193.25 (1.396) < 0.001
Triglyceride (mg/dL) 130.68 (3.151) 143.87 (3.559) 155.31 (4.443) 182.03 (6.145) < 0.001
AST (IU/L) 21.08 (0.245) 21.89 (0.228) 23.00 (0.292) 24.38 (0.305) < 0.001
ALT (IU/L) 20.72 (0.371) 23.47 (0.433) 24.78 (0.441) 28.70 (0.548) < 0.001
Hb (g/dL) 15.23 (0.039) 15.45 (0.036) 15.49 (0.033) 15.60 (0.041) < 0.001
TIBC (μg/dL) 320.41 (1.401) 309.24 (1.316) 306.42 (1.266) 302.56 (1.539) < 0.001
Cr (mg/dL) 0.95 (0.004) 0.96 (0.005) 0.96 (0.004) 0.96 (0.004) 0.011
WBC (103/uL) 6.20 (0.050) 6.29 (0.054) 6.31 (0.050) 6.43 (0.051) 0.001
VitD (ng/mL) 18.36 (0.249) 18.35 (0.243) 18.45 (0.243) 18.13 (0.234) 0.540
Variables Quartiles of serum ferritin (ng/mL)
Quartile 1 (≤ 66.82) Quartile 2 (66.83–100.78) Quartile 3 (100.79–149.13) Quartile 4 (> 149.13) p-value
Smoking status (%)
 Quit smoker or non-smoker 681 (58.7) 635 (52.5) 586 (46.9) 605 (50.7) < 0.001
 Current smoker 430 (41.3) 473 (47.5) 524 (53.1) 504 (49.3)
Alcohol intake (%)
 Less than once a month 445 (37.1) 339 (29.5) 307 (28.3) 258 (20.6) < 0.001
 More than twice a month 664 (62.9) 764 (70.5) 797 (71.7) 845 (79.4)
Hypertension (%)
 Hypertension (−) 770 (74.8) 760 (73.7) 779 (73.0) 723 (68.5) 0.029
 Hypertension (+) 341 (25.2) 350 (26.3) 332 (27.0) 387 (31.5)
  1. Data are presented as the mean (standard deviation), or numbers (percentages)
  2. SBP systolic blood pressure, DBP diastolic blood pressure, WC waist circumference, BMI body mass index, FBS fasting blood sugar, TC total cholesterol, AST aspartate transaminase, ALT alanine transaminase, Hb hemoglobin, TIBC total iron-binding capacity, Cr creatinine, WBC white blood cell, VitD vitamin D