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. 2023 Aug 21;14(3):279–286. doi: 10.1016/j.shaw.2023.08.006

Table 3.

Time-dependent Cox regression analysis of metabolic syndrome according to double occupational exposure after adjusting for all demographic and behavioral risk factors

Risk factor A Risk factor B Exposure number (%)
HR (95% CI)
RERI MI
A B A&B A B A&B
Night shift work Noise 16,264 (17.49) 6523 (7.01) 2499 (2.69) 1.42 (1.33, 1.53) 1.10 (1.01, 1.20) 1.66 (1.45, 1.90) 0.13 1.06
Night shift work Toluene 18,606 (20.01) 1025 (1.1) 157 (0.17) 1.45 (1.36, 1.54) 1.41 (1.15, 1.72) 2.43 (1.55, 3.81) 0.58 1.20
Night shift work Xylene 18,671 (20.08) 400 (0.43) 92 (0.1) 1.45 (1.36, 1.54) 1.71 (1.28, 2.27) 2.14 (1.18, 3.87) -0.02 0.87
Night shift work Dichloromethane 18,659 (20.06) 539 (0.58) 104 (0.11) 1.45 (1.36, 1.55) 1.53 (1.19, 1.97) 1.38 (0.73, 2.61) -0.61 0.62
Night shift work Trichloroethylene 18,760 (20.17) 313 (0.34) 3 (0) 1.45 (1.36, 1.55) 1.92 (1.42, 2.61) 17.19 (1.53, 192.73) 14.81 6.15
Night shift work Dimethylformamide 18,756 (20.17) 210 (0.23) 7 (0.01) 1.45 (1.36, 1.54) 2.15 (1.28, 3.61) 10.71 (1.45, 79.00) 8.11 3.44
Night shift work Fe 18,511 (19.91) 1113 (1.2) 252 (0.27) 1.46 (1.37, 1.56) 1.39 (1.16, 1.65) 1.18 (0.75, 1.85) -0.67 0.58
Night shift work Mn 18,637 (20.04) 713 (0.77) 126 (0.14) 1.45 (1.36, 1.55) 1.27 (1.01, 1.59) 1.73 (1.01, 2.97) 0.01 0.94
Night shift work Pb 18,707 (20.12) 389 (0.42) 56 (0.06) 1.44 (1.35, 1.54) 1.23 (0.86, 1.76) 3.33 (2.03, 5.47) 1.66 1.88∗
Night shift work Cu 18,623 (20.03) 299 (0.32) 140 (0.15) 1.45 (1.36, 1.55) 2.10 (1.61, 2.74) 1.76 (1.08, 2.87) -0.79 0.58
Night shift work Sb 18,752 (20.16) 129 (0.14) 11 (0.01) 1.45 (1.36, 1.54) 1.77 (1.00, 3.12) 3.48 (0.98, 12.37) 1.27 1.36
Noise Toluene 8868 (9.54) 1028 (1.11) 154 (0.17) 1.15 (1.07, 1.24) 1.42 (1.16, 1.74) 1.65 (1.05, 2.59) 0.08 1.01
Noise Xylene 8937 (9.61) 407 (0.44) 85 (0.09) 1.15 (1.07, 1.24) 1.67 (1.26, 2.22) 1.85 (1.02, 3.36) 0.03 0.97
Noise Styrene 8992 (9.67) 154 (0.17) 30 (0.03) 1.15 (1.07, 1.24) 1.51 (0.98, 2.31) 1.75 (0.69, 4.42) 0.09 1.00
Noise Trichloroethylene 8995 (9.67) 289 (0.31) 27 (0.03) 1.15 (1.07, 1.24) 1.85 (1.35, 2.53) 2.59 (1.02, 6.57) 0.59 1.22
Noise Fe 8508 (9.15) 851 (0.92) 514 (0.55) 1.14 (1.06, 1.23) 1.23 (0.99, 1.52) 1.42 (1.10, 1.83) 0.05 1.01
Noise Mn 8691 (9.35) 508 (0.55) 331 (0.36) 1.15 (1.07, 1.25) 1.30 (1.00, 1.70) 1.22 (0.87, 1.70) -0.24 0.81
Noise Pb 8904 (9.57) 327 (0.35) 118 (0.13) 1.15 (1.07, 1.24) 1.51 (1.06, 2.14) 1.19 (0.68, 2.09) -0.47 0.68
Noise Cu 8895 (9.57) 312 (0.34) 127 (0.14) 1.15 (1.06, 1.24) 1.91 (1.44, 2.54) 1.89 (1.24, 2.88) -0.17 0.86
Noise Sb 8973 (9.65) 91 (0.1) 49 (0.05) 1.15 (1.07, 1.24) 1.65 (0.81, 3.34) 2.19 (0.96, 4.99) 0.39 1.16
Toluene Xylene 802 (0.86) 112 (0.12) 380 (0.41) 1.28 (1.00, 1.64) 1.72 (0.92, 3.21) 1.66 (1.26, 2.19) -0.34 0.75
Toluene Styrene 1090 (1.17) 92 (0.1) 92 (0.1) 1.37 (1.12, 1.67) 1.12 (0.59, 2.14) 1.91 (1.19, 3.07) 0.42 1.24
Toluene Cu 1062 (1.14) 319 (0.34) 120 (0.13) 1.38 (1.12, 1.68) 1.90 (1.44, 2.50) 1.83 (1.15, 2.91) -0.45 0.70
Toluene Sb 1174 (1.26) 132 (0.14) 8 (0.01) 1.42 (1.18, 1.71) 1.83 (1.04, 3.23) 1.94 (0.58, 6.54) -0.31 0.75
Xylene Styrene 414 (0.45) 106 (0.11) 78 (0.08) 1.58 (1.17, 2.12) 1.10 (0.59, 2.04) 2.05 (1.27, 3.32) 0.38 1.18
Xylene Fe 460 (0.49) 1333 (1.43) 32 (0.03) 1.60 (1.23, 2.10) 1.25 (1.06, 1.48) 3.00 (1.20, 7.53) 1.15 1.50
Xylene Pb 466 (0.5) 419 (0.45) 26 (0.03) 1.65 (1.26, 2.15) 1.34 (0.97, 1.84) 2.10 (0.79, 5.58) 0.12 0.95
Xylene Cu 362 (0.39) 309 (0.33) 130 (0.14) 1.60 (1.17, 2.19) 1.88 (1.42, 2.49) 1.86 (1.19, 2.90) -0.62 0.62
Styrene Pb 164 (0.18) 425 (0.46) 20 (0.02) 1.34 (0.87, 2.07) 1.28 (0.93, 1.76) 3.27 (1.36, 7.84) 1.64 1.90
Styrene Cu 130 (0.14) 385 (0.41) 54 (0.06) 1.10 (0.64, 1.91) 1.77 (1.36, 2.29) 2.61 (1.52, 4.49) 0.74 1.34
Styrene Sb 182 (0.2) 138 (0.15) 2 (0) 1.47 (0.99, 2.17) 1.74 (1.01, 2.99) 13.42 (1.44, 124.94) 11.22 5.27
Dichloromethane Trichloroethylene 533 (0 .57) 206 (0.22) 110 (0.12) 1.37 (1.05, 1.80) 2.06 (1.42, 2.99) 1.58 (0.98, 2.55) -0.85 0.56
Dichloromethane Cu 616 (0.66) 412 (0.44) 27 (0.03) 1.39 (1.09, 1.77) 1.86 (1.46, 2.37) 2.19 (0.76, 6.32) -0.06 0.85
Trichloroethylene Cu 309 (0.33) 432 (0.46) 7 (0.01) 1.81 (1.33, 2.45) 1.83 (1.44, 2.33) 9.59 (2.04, 45.05) 6.95 2.90
Fe Mn 605 (0.65) 79 (0.08) 760 (0.82) 1.27 (0.99, 1.62) 0.78 (0.28, 2.15) 1.28 (1.03, 1.59) 0.23 1.30
Fe Cu 1328 (1.43) 402 (0.43) 37 (0.04) 1.25 (1.06, 1.48) 1.82 (1.42, 2.35) 2.44 (1.13, 5.31) 0.37 1.07
Fe Sb 1322 (1.42) 97 (0.1) 43 (0.05) 1.25 (1.06, 1.48) 1.68 (0.91, 3.11) 2.11 (0.86, 5.22) 0.18 1.00
Mn Cu 809 (0.87) 409 (0.44) 30 (0.03) 1.21 (0.97, 1.50) 1.83 (1.43, 2.35) 2.44 (1.04, 5.72) 0.40 1.10
Mn Sb 834 (0.9) 135 (0.15) 5 (0.01) 1.23 (1.00, 1.52) 1.74 (1.02, 2.98) 11.53 (2.50, 53.12) 9.56 5.38∗
Pb Cu 400 (0.43) 394 (0.42) 45 (0.05) 1.27 (0.91, 1.77) 1.83 (1.42, 2.36) 2.27 (1.13, 4.58) 0.17 0.98

Relative excess risk due to interaction (RERI) = HR11 - HR10 - HR01 + 1.

MI (multiplicative effect) = HR11/(HR01 × HR10); HR, Hazard ratio; CI, confidence interval.

∗ Refers to the value of statistical significance (p < 0.05).