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Table 4 Total blood mercury concentrations by Jesa-related characteristics

From: The associations between blood mercury levels and shark meat intake among workers in Gyeongsangbuk-do

Characteristics Total Shark consumption Non-consumption
Number (%) Concentrationsa Number (%) Concentrationsa Number (%) Concentrationsa
Frequency of Jesa b
 0 264 (35.1) 3.31 (3.07–3.56) 1 (0.3) 4.18 (1.29–13.54) 263 (70.3) 3.13 (2.93–3.35)
 1–2 194 (25.8) 4.20 (3.87–4.55) 162 (42.7) 4.41 (4.03–4.84) 32 (8.6) 4.16 (3.43–5.05)
 3–4 190 (25.2) 4.91 (4.52–5.34) 137 (36.1) 5.18 (4.69–5.73) 53 (14.2) 4.53 (3.90–5.27)
 5≤ 105 (13.9) 4.96 (4.45–5.53) 79 (20.8) 5.70 (5.01–6.50) 26 (7.0) 3.69 (3.00–4.54)
p-valued   < 0.001   0.010   < 0.001
Shark meat usage in Jesa c
 0 310 (41.2) 3.67 (3.43–3.92) 3 (0.8) 4.71 (2.40–9.22) 307 (82.1) 3.38 (3.18–3.59)
 1–2 198 (26.3) 4.09 (3.77–4.43) 178 (47.0) 4.41 (4.04–4.82) 20 (5.3) 4.07 (3.20–5.18)
 3–4 153 (20.3) 4.77 (4.34–5.23) 126 (33.2) 5.36 (4.83–5.95) 27 (7.2) 3.52 (2.86–4.33)
 5≤ 92 (12.2) 4.79 (4.25–5.39) 72 (19.0) 5.63 (4.91–6.46) 20 (5.3) 3.31 (2.60–4.20)
p-valued   < 0.001   0.001   0.508
  1. aAdjusted for age, sex, smoking status, alcohol consumption and residential area, and expressed as geometric mean (95% confidential interval), unit: μg/L
  2. bNumber of times participated in Jesa (per year)
  3. cNumber of times shark meat consumed in Jesa (per year)
  4. dCalculated by ANCOVA
  5. GM geometric mean
  6. CI confidential interval