A Series from the Canadian Medical Association Journal

Introduction to the series
CMAJ. 2004 Aug 17;171(4):347-348.

1. Relative risk reduction, absolute risk reduction and number needed to treat
CMAJ. 2004 Aug 17;171(4):353-358.

2. Measures of precision (confidence intervals)
CMAJ. 2004 Sep 14;171(6):611-615.

3. Measures of observer variability (kappa statistic)
CMAJ. 2004 Nov 23;171(11):1369-1373.

4. Assessing heterogeneity of primary studies in systematic reviews and whether to combine their results
CMAJ. 2005 March 1;172(5):661-665.

5. The effect of spectrum of disease on the performance of diagnostic tests
CMAJ. 2005 March 1;172(5):661-665.