> The researchers also did not account for some risk factors for melanoma, such as mole count, hair colour, history of severe sunburn and sun-related behaviours

> The researchers also did not account for some risk factors for melanoma, such as mole count, hair colour, history of severe sunburn and sun-related behaviours in their analyses. Not controlling for sun behavior is really problematic as that tends to differ in coastal from more continental places which also correlates with fish consumption. Edit: Crossed with christophilus post who made a similar comment