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Guyatt G, Jaeschke R, Heddle N, Cook D, Shannon H, Walter S. Basic statistics for clinicians: 2. interpreting study results: Confidence intervals. CMAJ. 1995 Jan 15;152(2):169-73.

Jaeschke R, Guyatt G, Shannon H, Walter S, Cook D, Heddle N. Basic statistics for clinicians: 3. assessing the effects of treatment: Measures of association. CMAJ. 1995 Feb 1;152(3):351-7.

Guyatt G, Walter S, Shannon H, Cook D, Jaeschke R, Heddle N. Basic statistics for clinicians: 4. correlation and regression. CMAJ. 1995 Feb 15;152(4):497-504.