Table 2 Statistical description to BTEX exposure (mg/m3) in various workstations in summer and winter seasons.

From: Summer and winter variations of BTEX concentrations in an oil refinery complex and health risk assessment based on Monte-Carlo simulations

Work-station

Pollutant

Summer season

Winter season

P value

Range

Mean

Standard deviation

Range

Mean

Standard deviation

mg/m3

Supervisors

Benzene

0.032–2.556

0.359

0.626

0.032–0.831

0.267

0.228

0.052

Toluene

0.038–3.806

1.129

1.508

0.038–3.429

1.078

1.294

0.197

Ethylbenzene

0.004–3.951

1.032

1.342

0.043–4.168

1.002

1.441

0.071

Xylene

0.043–3.391

0.755

1.042

0.004–3.083

0.533

0.986

0.002

Safetymen

Benzene

0.003–2.140

0.522

0.660

0.032–1.636

0.384

0.485

0.039

Toluene

0.038–4.937

1.160

1.705

0.038–4.145

0.782

1.380

0.001

Ethylbenzene

0.043–4.776

1.333

1.639

0.004–3.517

0.734

1.285

0.002

Xylene

0.043–4.264

0.975

1.379

0.004–2.649

0.735

1.078

0.008

Repairmen

Benzene

0.073–19.775

7.193

7.166

0.351–7.539

2.023

1.944

0.001

Toluene

0.136–79.139

27.200

29.304

0.038–41.454

10.070

12.467

0.001

Ethylbenzene

0.043–95.522

18.326

26.886

0.043–44.722

10.027

14.537

0.033

Xylene

0.043–44.722

14.833

15.257

0.004–43.853

10.615

13.323

0.008

Site men

Benzene

0.064–20.190

4.311

5.622

0.511–10.031

3.369

2.540

0.043

Toluene

2.540–64.856

26.791

22.749

0.113–37.685

13.685

11.958

0.001

Ethylbenzene

0.043–52.668

15.822

15.783

0.043–52.103

12.135

14.422

0.031

Xylene

0.043–66.041

14.242

19.846

0.043–40.467

13.325

13.172

0.045

All workers

Benzene

0.003–20.190

3.073

5.307

0.032–10.031

1.534

2.045

0.001

Toluene

0.037–79.139

14.070

22.310

0.038–41.454

6.404

10.188

 < 0.001

Ethylbenzene

0.043–95.522

9.121

17.231

0.004–52.103

5.982

11.284

 < 0.001

Xylene

0.043–44.722

7.472

11.908

0.004–66.041

6.531

13.158

 < 0.001

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