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Table 1 Characteristics, benzene exposure levels, fat content, and erythroid-related hematologic parameters in workers in different workplaces

From: Influence of benzene exposure, fat content, and their interactions on erythroid-related hematologic parameters in petrochemical workers: a cross-sectional study

Variablesa Control group (n = 338) Exposed group (n = 1331) P value
General characteristics
 Age (years) 46.46 ± 7.25 40.20 ± 7.37 < 0.001b
 Gender (male/female, %male) 237/101 (70.10) 1014/317 (76.20) 0.022c
 Smoking status (smoker/non-smoker, %smoker) 98/240 (29.00) 466/865 (35.00) 0.037c
 Drinking status (drinker/non-drinker, %drinker) 103/235 (30.50) 490/841 (36.80) 0.030c
 Work years (years) 25.94 ± 8.45 18.93 ± 8.52 < 0.001b
Benzene exposure levels
 SPMA (μg/g creatinine) 0.18 (0.09, 0.44) 0.37 (0.15, 1.09) < 0.001d
Fat content indices
 BF% (%) 26.66 ± 5.29 23.67 ± 23.67 0.003e
 TC (mmol/L) 5.48 ± 0.94 5.20 ± 0.96 0.410d
 TG (mmol/L) 1.66 ± 1.11 1.59 ± 1.41 0.305d
 Fatty liver (yes/no, %yes) 84/250 (25.10) 311/1016 (23.40) 0.551c
Erythroid-related hematologic parameters
 RBC count (×1012/L) 4.94 ± 0.58 4.96 ± 0.58 0.157d
 Hb (g/L) 142.71 ± 13.93 143.60 ± 14.53 0.286d
 HCT (%) 42.62 ± 3.52 43.25 ± 4.07 0.027d
 MCV (fL) 86.90 ± 8.15 87.70 ± 8.17 0.030d
 MCHC (g/L) 336.87 ± 8.22 331.92 ± 10.53 < 0.001d
 RDW-CV (%) 12.90 ± 1.03 13.17 ± 1.36 0.792d
 RDW-SD (fL) 39.87 ± 2.57 43.86 ± 3.35 < 0.001d
  1. Abbreviations: SPMA S-phenylmercapturic acid, BF% Body fat percentage, TC Plasma total cholesterol, TG Plasma triglycerides, RBC Red blood cell, Hb Hemoglobin concentration, HCT Hematocrit, MCV Mean corpuscular volume, MCHC Mean corpuscular hemoglobin concentration, RDW-CV Red cell distribution width-coefficient of variation, RDW-SD Red cell distribution width-standard deviation
  2. a Values were shown by n (%), mean ± SD, or median (25th percentile, 75th percentile)
  3. b Student’s t-test
  4. c Chi-squared test
  5. d Multivariate analysis of covariance, adjusted by age, gender, smoking status, drinking status, and work years
  6. e Multivariate analysis of covariance, adjusted by smoking status, drinking status, and work years