Risk factors of high Comet scores

Unadjusted OR (95% CI)

Adjusted OR (95% CI)

Use of hair straightening/week (>8)

9.8 (2.5 - 13.2)^*

7.2 (2.8 - 13.6)^*

Use hair dyes/week (>15)

6.7 (1.6 - 5.3)^*

4.5 (2.4 - 8.6)^*

Length of service (>13)

7.1 (2.84 - 11.2)^*

3.7 (1.7 - 6.7)^*

Wearing gloves during work (No)

6.1 (1.3 - 12.2)^*

2.6 (1.6 - 7.2)^*

Use of bleaching agent/week (>12)

5.3 (1.2 - 16.2)^*

2.1 (1.8 - 4.2)^*

Hand washing after handling chemicals (No)

7.7 (1.9 - 18.9)^*

1.8 (1.2 - 4.3)^*

Frequent use of personal hair dyes/year(>8)

5.1 (2.3 - 16.6)^*

2.9 (0.82 - 6.4)

Wearing personal protective equipment (No)

6.5 (1.8 - 11.6)^*

2.2 (0.07 - 6.1)

Working hours per week (>50)

4.2 (2.1 - 6.3)^*

1.1 (0.6 - 5.4)

Use of hair spray/week (≥9)

3.5 (0.79 - 6.5)

-

Age (>29)

3.5 (0.73 - 7.9)

-

Covering injured skin during work (no)

3.2 (0.7 - 9.5)

-

Education (illiterate, read and write)

2.0 (0.23 - 10.8)

-

Personal use of hair dyes (yes)

1.5 (0.86 - 4.6)

-

Protective creams on exposed skin (no)

0.8 (0.07 - 9.2)

-

Residence (urban)

0.38 (0.01 - 6.2)

-