That's 0.5 percentage points. Would be nice to get that metric, too, alongside percentages sometimes. Here the initial likelihood is relatively high, when the likelihood is low, percentage increases can be very misleading. Particularly if the uncertainty around the increase is high.
Non-Hodgkin lymphoma (NHL) is a cancer that starts in lymphocytes, a type of white blood cell that helps fight infection. Lymphocytes are found in the bloodstream but also in the lymph system and throughout the body.
From the article: "we found that the risk of developing lymphoma was 21 percent higher among those who were tattooed"
Let's put this number into context, because "percent of increased risk" is always something I struggle to picture"
"Overall, the chance that a man will develop NHL in his lifetime is about 1 in 42; for a woman, the risk is about 1 in 52." [1]
So the overall risk is ~2 %. That means getting a tattoo will bring your overall risk of developing NHL from 2 % to 2.5 % instead.
[1] https://www.cancer.org/cancer/types/non-hodgkin-lymphoma/abo...