Table 4. A Multivariate Logistic Regression Analysis of Factors Affecting Occupational Skin Diseases.

Variables	Subjects with skin disease [odds ratio (95% CI)]	Male [odds ratio (95% CI)]	Female [odds ratio (95% CI)]
Male sex	0.842 (0.608–1.166)	NA	NA
Age (years)	0.998 (0.985–1.011)	0.990 (0.971–1.009)	1.005 (0.987–1.023)
Monthly income (2.5 million won–4 million won)	1.533* (0.047–2.245)	1.317 (0.781–2.222)	1.943* (1.084–3.483)
Educational status below high school	1.755† (1.220–2.525)	1.894* (1.123–3.193)	1.550 (0.914–2.629)
Self-employed status	0.978 (0.628–1.524)	0.651 (0.333–1.273)	1.379 (0.749–2.539)
Small number of employees	1.001 (0.872–1.148)	1.169 (0.946–1.446)	0.874 (0.723–1.057)
Longer working duration (years)	0.999 (0.998–1.001)	0.999 (0.997–1.002)	0.999 (0.997–1.002)
Longer working hours per week	1.016† (1.005–1.027)	1.013 (0.997–1.030)	1.019* (1.004–1.034)
Engaged in work requiring protective equipment	2.187‡ (1.521–3.145)	2.636† (1.522–4.564)	1.869* (1.134–3.080)
Information for occupational safety and health	0.986 (0.712–1.365)	0.903 (0.538–1.517)	1.053 (0.683–1.625)
Vibration exposure	0.881 (0.598–1.296)	0.740 (0.423–1.295)	1.025 (0.589–1.785)
High temperature exposure	2.096‡ (1.425–3.083)	2.276† (1.306–3.968)	1.897* (1.086–3.313)
Low temperature exposure	1.168 (0.729–1.869)	1.136 (0.597–2.160)	1.259 (0.617–2.566)
Skin contact with chemical products	2.326† (1.435–3.770)	2.085* (1.099–3.957)	2.812* (1.285–6.151)
Breathing in smoke/fumes/powder/dust	1.197 (0.779–1.840)	1.157 (0.626–2.138)	1.230 (0.654–2.313)
Breathing in vapors	0.857 (0.437–1.681)	0.860 (0.367–2.016)	0.865 (0.260–2.878)

CI, confidence interval; NA, not applicable.

Statistical significance was evaluated using multivariate logistic regression analyses ^*p<0.05, ^†p<0.01, ^‡p<0.001.