Table 3.

Adjustment carried out in 10 cohorts that assessed effects of omega 3 fats on cancer

Factors*	No of cohorts adjusted†
Lifestyle factors
Smoking	2
Alcohol intake	2
Physical activity	1
Dietary fibre intake	1
Saturated fat intake	1
Trans fat intake	0
Red meat intake	2
Fruit intake	0
Vegetable intake	0
Others‡:
Body mass index	4
Total energy intake	5
Other dietary factors, height, parity, and menopausal status
1 each	Social factors
Place of residence	2
Education	2
Other‡:
Ethnic origin	1
Socioeconomic status	1
Interest in health
Vitamin E supplementation	0
Multivitamin supplementation	0
Others‡:
Use of hormone replacement therapy	1
Family history of the disease studied	2
Precancerous symptoms	1

^*Factors that differ consistently between people taking most and least fish based omega 3 fats; the association was consistent across all cohorts that assessed it and was seen in at least two cohorts.

^†The number of cohorts that adjusted for the factor in the most adjusted analysis, of the 10 cohorts used in the cancer outcomes analysis. Six cohorts also adjusted for age.

^‡Unclear if consistently associated with omega 3 fats.