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Letters to the Editor
February 1999

Violence in the Mentally Ill: Questions Remain—Reply

Arch Gen Psychiatry. 1999;56(2):193-194. doi:

In reply

Czobor and Volavka's comments contain 3 main points. First, they are concerned that we used a log-linear model to analyze differences in aggregate rates of violence and that we ignored within-subject variability. Second, they hypothesize that the observed downward trend in postdischarge violence rates is due to the "biased attrition" of a certain group of patients "with persistent, recidivistic violence." Finally, Czobor and Volavka are concerned that our treatment of "time at risk" as a covariate in attempting to explain the observed decline in violence violated an assumption of independence.

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