title: Erratum.
abstract: Breitenstein, S. M., Gross, D., Christophersen, R. (2014). Digital delivery methods of parenting training interventions: A systematic review. Worldviews on Evidence-Based Nursing, 11(3), 168-176. doi: 10.1111/wvn.12040. In the second paragraph of the Data Analysis Procedures section on page 170, the effect size calculation for d is incorrect. The correct calculation is below.