|Study group||Weighted mean reduction (95% CI)|
|AHA=American Heart Association.|
|*Heterogeneity existed among trials.|
|All studies*||5.7% (5.2 to 6.3)|
|AHA step 1 diets||3.0% (1.8 to 4.1)|
|AHA step 2 diets*||5.6% (4.7 to 6.5)|
|Change in fat ratio diets*||7.6% (6.2 to 9.0)|
|Reduction in total fat diets||5.8% (3.8 to 7.8)|
Review: dietary advice leads to a modest reduction in blood cholesterol concentration
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