Effectiveness and uptake of screening programmes for coronary heart disease and diabetes: a realist review of design components used in interventions.

After 3 months, patients who had abnormal cholesterol levels had a significantly greater reduction in dietary fat intake than patients with normal cholesterol results (F(2,388)=3.6, p=0.03); correlational analysis showed a highly significant link between reduction in fat intake and reduction in blood cholesterol (the researchers report an R 2 of 0.5, p=0.001, but confirmed by email that a Pearson's correlation was intended).

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