Risk Estimate

Value

95% Confidence Interval

Upper

Lower

Odds ratio for modified grading (none & mild vs. moderate & severe)

0.352

0.136

0.914

For cohort pigmentation (none & mild)

0.792

0.662

0.947

For cohort pigmentation (moderate & severe)

2.248

1.021

4.950

Number of valid cases

151