Each author declares that they have no potential conflict of interest.
A survival analysis for recurrent events in psychiatric research
Article first published online: 8 MAR 2004
Volume 6, Issue 2, pages 115–121, April 2004
How to Cite
Baethge, C. and Schlattmann, P. (2004), A survival analysis for recurrent events in psychiatric research. Bipolar Disorders, 6: 115–121. doi: 10.1111/j.1399-5618.2004.00104.x
- Issue published online: 8 MAR 2004
- Article first published online: 8 MAR 2004
- Received 23 January 2003, revised and accepted for publication 26 November 2003
- bipolar disorder;
- Kaplan–Meier analysis;
- survival analysis
Objectives: Time to first recurrence, as analyzed by the Kaplan–Meier (KM) survival analysis, is a commonly applied statistical method in psychiatric research. However, many psychiatric disorders are characterized not by a single event, but rather by recurrent events, such as multiple affective episodes. This study aims to demonstrate a method of survival analysis that takes multiple recurrences into account.
Methods: We examined data on sex differences in a sample of 181 patients undergoing prophylactic treatment with lithium or carbamazepine (serum level assayed) for bipolar disorder (ICD-10). The classical KM method was compared with an approach developed by Peña, Strawderman and Hollander (PSH) that uses recurrent event data to estimate survival function.
Results: The results obtained with the multiple events method differed considerably from those acquired using the standard KM analysis. When taking recurrent event data into account, the probability of remaining well was lower and survival times were longer. In addition, whereas the standard KM analysis indicated that male patients had a higher likelihood of remaining well, the alternative method revealed that both sexes were similarly likely to remain well.
Conclusions: Survival analysis techniques that take recurrent events into account are potentially important instruments for the study of psychiatric conditions characterized by multiple recurrences. In many cases, the standard KM analysis appears to provide only a rough approximation of the course of illness.