tea drinking correlates with low ovarian cancer rates in Sweden
twenty-nineth in a series of posts about taking tiffin with (black) tea in the NW USA Sweden.
Thursday Tiffin #29: tea drinking correlates with low ovarian cancer rates in Sweden
It’s disappointing that the BBC report implies that a correlation could be a causal link. Drinking tea in Sweden may also correlate with some other factor, e.g. drinking milk, that is actually causing the reduced ovarian cancer rates measured in tea drinkers. While the numbers of women (60,000) tracked in the longitudinal (1987 to 1990) research are impressive shere numbers alone cannot influnce whether it is possible to determine a causal link between ovarian cancer and tea drinking. In a correlational research design your cannot conclude causality. Full stop. Period.
