[romseb]

Genetic predispositions, obesity and a lot of other factors also play a role in the risk of developing lymphoma.

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...

[juujian]

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.

[arisAlexis]

It's still important if there is a connection

[dgellow]

The study doesn’t say there is a connection though. Just that there may be some correlation

[robocat]

> NHL

  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.