Postcards from the EDge: 24-month outcomes of a randomised controlled trial for hospital-treated self-poisoning.
BACKGROUND
Repetition of self-poisoning is common.


OBJECTIVE
To report the 24-month outcomes of a non-obligatory postcard intervention (plus treatment as usual) compared with treatment as usual.


METHODS
In a randomised-controlled trial (Zelen design) conducted in Newcastle, Australia, eight postcards were sent to participants over a 12-month period. The principal outcomes were the proportion of participants with one or more repeat episodes of self-poisoning and the number of repeat episodes per person.


RESULTS
No significant reduction was observed in the proportion of people repeating self-poisoning in the intervention group (21.2%, 95% CI 17.0-25.3) compared with the control group (22.8%, 95% CI 18.7-27.0; chi(2)=0.32, d.f.=1, P=0.57); the difference between groups was -1.7% (95% CI -7.5 to 4.2). There was a significant reduction in the rate of repetition, with an incidence risk ratio of 0.49 (95% CI 0.33-0.73).


CONCLUSIONS
A postcard intervention maintained the halving of the rate of repetition of hospital-treated self-poisoning events over a 2-year period, although it did not significantly reduce the proportion of individuals who repeated self-poisoning.
Carter
Gregory L
GL
Department of Consultation-Liaison Psychiatry, Locked Bag 7, Hunter Region Mail Centre, NSW 2310, Australia. Gregory.Carter@newcastle.edu.au
Clover
Kerrie
K
Whyte
Ian M
IM
Dawson
Andrew H
AH
D'Este
Catherine
C
D000328:Adult; D015709:Correspondence as Topic; D005260:Female; D006801:Humans; D008297:Male; D009517:New South Wales; D011041:Poisoning / Q000517:prevention & control* / Q000523:psychology; D012307:Risk Factors; D055502:Secondary Prevention; D016728:Self-Injurious Behavior / Q000517:prevention & control* / Q000523:psychology; D016896:Treatment Outcome