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Table 1 Summary relative risk estimates from observational studies of fat intake* and breast cancer risk, along with corresponding projections from international correlational analyses

From: Future possibilities in the prevention of breast cancer: Fat and fiber and breast cancer research

  Total fat consumption quintile  
Data source 1 2 3 4 5 Trend test
Case-control studies [5*] 1.00 1.20 1.24 1.24 1.46 P = 0.0002
International data projection [23*] 1.00 1.11 1.19 1.28 1.42  
  Calorie-adjusted fat intake quintile  
Data source 1 2 3 4 5 Trend test
Cohort studies [3*] 1.00 1.01 1.12 1.07 1.05 P = 0.21
International data projection [23*] 1.00 1.07 1.12 1.19 1.27  
  1. *Most of the case-control studies and all cohort studies used a food frequency assessment of diet; international data projections include an accommodation of food frequency measurement error. Reference category.