Erratum

In the article “Explaining Odds Ratios” in the Journal of the Canadian Academy of Child and Adolescent Psychiatry, by Magdalena Szumilas, MSc¹ on the PubMed Central database at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2938757/ an equation appeared incorrectly. The error is in the Example, part A, the correctly re-arranged equation appears below.

$$\text{OR}=\frac{\left(\text{n}\right)\hspace{0.17em}\text{exposed}\hspace{0.17em}\text{cases}/\left(\text{n}\right)\hspace{0.17em}\text{unexposed}\hspace{0.17em}\text{cases}}{\left(\text{n}\right)\hspace{0.17em}\text{exposed}\hspace{0.17em}\text{non-cases}/\left(\text{n}\right)\hspace{0.17em}\text{unexposed}\hspace{0.17em}\text{non-cases}}=\frac{\left(\text{n}\right)\hspace{0.17em}\text{exposed}\hspace{0.17em}\text{cases}\times \left(\text{n}\right)\hspace{0.17em}\text{unexposed}\hspace{0.17em}\text{non-cases}}{\left(\text{n}\right)\hspace{0.17em}\text{exposed}\hspace{0.17em}\text{non-cases}\times \left(\text{n}\right)\hspace{0.17em}\text{unexposed}\hspace{0.17em}\text{cases}}$$

The Journal regrets this error an any inconvenience caused.