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Keith Hawton a University of Oxford, Department of Psychiatry,
Warneford Hospital, Oxford OX3 7JX, b ICRF/NHS Centre for Statistics in
Medicine, Institute of Health Sciences, Oxford OX3 7LF, c United Bristol Healthcare Trust,
Directorate of Mental Health, Barrow Hospital, Bristol BS19 3SG, d University of Oxford, Nuffield Department of Orthopaedic
Surgery, John Radcliffe Hospital, Oxford OX3 9DU, e Glasgow University Media
Unit, Glasgow G12 8LF
Correspondence to: Professor Hawton
Keith.Hawton{at}psychiatry.oxford.ac.uk
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Abstract |
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Objectives:
To determine whether a serious paracetamol overdose in the medical television drama Casualty
altered the incidence and nature of general hospital presentations for
deliberate self poisoning.
Design:
Interrupted time series analysis of
presentations for self poisoning at accident and emergency departments
during three week periods before and after the broadcast. Questionnaire responses collected from self poisoning patients during the same periods.
Setting:
49 accident and emergency departments
and psychiatric services in United Kingdom collected incidence data; 25 services collected questionnaire data.
Subjects:
4403 self poisoning patients; questionnaires completed for 1047.
Main outcome measures:
Change in presentation rates
for self poisoning in the three weeks after the broadcast compared with
the three weeks before, use of paracetamol and other drugs for self
poisoning, and the nature of overdoses in viewers of the broadcast
compared with non-viewers.
Results:
Presentations for self poisoning increased by
17% (95% confidence interval 7% to 28%) in the week after the broadcast and by 9% (0 to 19%) in the second week. Increases in paracetamol overdoses were more marked than increases in
non-paracetamol overdoses. Thirty two patients who presented in the
week after the broadcast and were interviewed had seen the
episode
20% said that it had influenced their decision to take an
overdose, and 17% said it had influenced their choice of drug. The use
of paracetamol for overdose doubled among viewers of
Casualty after the episode (rise of 106%; 28% to
232%).
Conclusions:
Broadcast of popular television dramas
depicting self poisoning may have a short term influence in terms of
increases in hospital presentation for overdose and changes in the
choice of drug taken. This raises serious questions about the
advisability of the media portraying suicidal behaviour.
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Key messages
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Introduction |
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The possibility that media representation of suicide and deliberate self harm may encourage suicidal behaviour in vulnerable individuals has attracted considerable attention, 1 2 not least because it is a potentially modifiable factor. Studies of televised news reports of suicides have suggested associations with a short term increased incidence of suicide, 3 4 especially if the reports are repeated and the deaths are highly publicised.5 Others have not shown such an effect. 6 7 Investigations of the effects of fictional portrayal of suicidal behaviour on television have also produced varying results,8 with some studies indicating a strong influence on suicides9-12 or on referrals for deliberate self harm.10 Recent studies in the United Kingdom found either no evidence13 or equivocal effects.14 Most studies in this area have been retrospective so that it has not been possible to investigate whether subjects have seen the media stimulus.1
Advance notice that an episode of the television drama series Casualty would include a serious overdose of paracetamol provided the opportunity to conduct a large scale prospective study of any possible effects on subsequent suicidal behaviour. The box describes the content of the episode, which was shown on 2 November 1996.
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Depiction of paracetamol overdose in episode of
Casualty
The overdose storyline involved an RAF pilot in his 30s who was having difficulty returning to work after the aircraft he was flying accidentally crashed, killing a colleague. His sense of guilt and fear that he might have epilepsy led to excessive drinking and marital conflict. He was taken to the accident and emergency department after collapsing, and, after a dramatic scene in which he vomited blood, it was discovered that his blood levels of paracetamol were high. Two nurses were shown urgently questioning him about a possible overdose, and when he admitted to taking about 50 paracetamol over two days earlier they looked very concerned. The dialogue emphasised the danger: Nurse: "You should have come in earlier. Paracetamol just keeps on working, steadily destroying the liver." Patient's wife: "What are you saying? It's too late?" The message was repeated in the final scene of the story: Doctor: "Your husband is suffering from severe liver damage caused by the paracetamol. It's disturbing his blood's ability to clot. We've got to transfer him to a specialist unit now .... It doesn't look very good." The episode contained several other storylines, including a female vagrant suffering a severe spinal cord lesion, a young boy being badly burned, a demanding middle aged businessman attending with a minor head injury, and a member of staff being diagnosed with multiple sclerosis. |
We aimed to investigate a possible association between the broadcast of
the programme and changes in presentation to general hospitals for
deliberate self poisoning (including changes in the substances taken).
In addition, a questionnaire survey of patients presenting with self
poisoning was undertaken to investigate direct links between viewing
the episode and decision to take an overdose, choice of drug, and speed
of presentation to hospital.
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Subjects and methods |
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Study centres were recruited from the 160 large accident and emergency departments (>35 000 new attendances a year15) in the United Kingdom and from general hospital psychiatric services. Participating centres were asked to provide weekly data on all presentations for overdose during the three weeks before the programme's broadcast (13 October to 2 November) and the three weeks after (3-23 November), giving three measurements before and after the intervention.16 Data were collected either through regular monitoring systems or specific counts for the study. Some psychiatric services could supply data only on patients referred for psychiatric assessment. Information was supplied on sex, age band, and use of paracetamol (if recorded).
Clinicians in general hospital psychiatric services were also asked to complete questionnaires after assessment of individual patients during the same period. The questionnaire recorded patients' sex, age, choice of drug (and, for those who took paracetamol compounds, whether they knew these contained paracetamol), time from overdose to presentation at the accident and emergency department, history of taking overdoses, and whether the choice of substance was influenced by anything they had seen on television. Patients were classified as viewers of Casualty if they presented in the baseline period and reported seeing the previous week's episode or if they presented after the broadcast and had seen the episode of 2 November. The latter patients were also asked whether viewing the episode had influenced their decision to take an overdose, their choice of drug, and how quickly they sought help. Fifty two hospitals participated across the United Kingdom (see acknowledgments).
We obtained data on suicides, deaths due to undetermined cause, and accidental deaths involving self poisoning with paracetamol and paracetamol compounds that occurred in England and Wales during 1996 from the Office for National Statistics. Viewing figures for Casualty were supplied by the BBC and converted to rates using population figures for the United Kingdom.17
Statistical analyses
We estimated baseline incidence rates of self harm from the counts
for the three weeks before the broadcast. The effect of the episode was
estimated by comparing incidence rates for the three weeks after the
episode with the baseline rates. Comparisons were initially made within
centres and then pooled using Poisson regression models that
incorporated repeated measures and allowed for variation between
centres in both baseline levels and changes after the
broadcast.18 The effects of age, sex, and choice of
substance were investigated by adding interaction terms to the models.
Comparisons were made between accident and emergency departments and
psychiatric services, and according to whether centres had participated
in the questionnaire section of the study. Changes in presentation
rates after the broadcast are reported as percentage changes with 95%
confidence intervals.
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2 test for trend
as appropriate. We used STATA19 and
EpiInfo20 software for analysis.
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Results |
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Presentation rates before and after Casualty
episode
Forty nine hospitals supplied data on presentations for overdose
(table 1). In the baseline period 2127 patients presented, while 2276 presented in the three weeks after the broadcast. There was a marked
increase in the number of self poisoning patients in the week after the
broadcast of the Casualty episode compared with the
baseline period for both paracetamol and non-paracetamol overdoses
(figure).
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Attendances by sex, age, and drug taken in overdose
During the baseline period, 52% of the patients were female; 36%
were aged <25, 30% were aged 25-34, and 34% were aged
35; and
38% of overdoses included paracetamol (table 3). Females showed a
somewhat larger increase in attendance rates than males (relative
increase in females compared with males was 12%;
1% to 28%).
Those aged 25-34 showed significantly different changes in attendance
rates after the broadcast compared with the other age groups: their
increase in paracetamol overdoses was greater (P=0.005), and
non-paracetamol overdoses declined (P=0.002). The other age groups
showed small but similar increases for both types of
overdose.
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Deaths in England and Wales from paracetamol poisoning
We compared the numbers of deaths from paracetamol poisoning in
the three weeks before the broadcast with those in a three week period
lagged one week after the broadcast to account for the delay between
paracetamol ingestion and death. There was no evidence of increases in
mortality after the broadcast (ratio of number of deaths before to
number after was 14:15 for suicide, 14:8 for undetermined cause, 6:3
for accidents, and 34:26 combined). Use of a three day lag or no lag
gave similar results.
Questionnaire information
Twenty five hospitals supplied completed questionnaires on 1047 individual patients (table 1). Questionnaires were returned for 55%
(1047/1917) of patients in the hospitals who supplied weekly attendance
or referral counts and questionnaires. Table 4 shows that viewing of
Casualty by overdose patients in the baseline period was
slightly below official BBC figures for those episodes (average of 16%
v 22%). In the week after the broadcast 18% of
overdose patients had seen the episode (P=0.18 compared with before the
broadcast) while the official BBC figure remained at 22%. Few patients
reported that their choice of drug for self poisoning was influenced by
television programmes in general (table 4). Casualty
viewers attending after the episode were slightly more likely to state
that general television viewing influenced their choice of drug than
those attending before the broadcast (14% v 6%,
P=0.10).
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he died. Thought I'll try it next time I get
into trouble" "Knew what tablets to take"). However, some
patients said that they had avoided paracetamol because the episode
highlighted the dangers of liver damage (for example: "I didn't want
to wake up with liver damage and have a slow death"). Ten percent
said viewing the episode had influenced their speed of seeking help
after the overdose.
Comparison of viewers before and after the broadcast
In the patients who viewed the index Casualty episode there was a doubling in the number taking pure
paracetamol compared with Casualty viewers in the three
weeks before the episode (table 5). There was little change in the
choice of drug among non-viewers. Most patients presented within 12 hours of taking their overdoses, and this did not change among
Casualty viewers after broadcast of the index episode.
There was also no evidence that viewing the index episode encouraged
those without a history of self poisoning to take an overdose or those
who had never used paracetamol for self poisoning to do
so.
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Discussion |
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Portrayal of a paracetamol overdose in a popular television drama seems to have been followed by significant increases in presentations to general hospitals because of self poisoning. Increases of 17% and 9% were noted in the first and second weeks after the broadcast, and presentations returned to pre-broadcast levels in the third week. Increases were found for both paracetamol and non-paracetamol overdoses. There was no evidence of an impact on deaths from paracetamol poisoning, but this is not surprising as mortality from paracetamol overdose is relatively low.21
The increase in self poisoning rates was largest in 25-34 year olds, the age group that included the man who took the overdose in the index episode. Females were more likely to be Casualty viewers and showed somewhat greater increases than males. Of the patients who completed questionnaires after the broadcast, 63% of Casualty viewers were female compared with 52% of non-viewers. The proportion of females among viewers mirrors national rates (61%).
Casualty viewers might be more aware of paracetamol as a
dangerous means of overdose because of their general interest in medical matters.22 However, after the broadcast the
proportion of patients who were Casualty viewers and
used paracetamol for self poisoning doubled
an important finding
strongly suggesting that viewing the episode had influenced the choice
of substance.
Methodological issues
Several methodological considerations should be noted in
interpreting the increase in overdoses after the index Casualty episode. It seems unlikely that awareness of
the study hypothesis could have influenced data collection since much
of the data were based on routinely collected information. Also, the
three centres with established monitoring systems (Bristol, Derby, and
Oxford) noted increases in total overdoses in the period after the
broadcast, and increases in paracetamol overdoses were noted in Derby
and Oxford (Bristol did not report data on overdose substances).
Conclusions
Our findings about short term changes in presentations for self
harm are in keeping with those of an earlier study in adolescents in
the United States,10 and raise serious concerns about the
facilitating effect on suicidal behaviour of media portrayals of self
poisoning or self injury. This is especially so for popular soap
programmes. In addition to being associated with an increase in self
harming behaviour, media portrayals seem to influence the choice of
method, which is particularly dangerous if it concerns a method such as
paracetamol overdose.
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Acknowledgments |
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We thank Barbara Machin for her contribution to the study, the BBC for supplying detailed audience viewing figures, and the Office for National Statistics for supplying mortality data.
Contributors: All authors participated in the design of the study, regular meetings to discuss the results and their interpretation, and the preparation of the report. KH and SS designed the questionnaires. KH, SS, and JJD took main responsibility for analysing the results, interpreting the findings, and preparing the report. SS and AK coordinated the data collection. DGA provided statistical advice. CB initiated the study. KH is guarantor for the study.
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Footnotes |
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Funding: This study was funded by the Nuffield Trust. KH and SS were also supported by Anglia and Oxford NHS Executive Research and Development Committee.
Competing interests: None declared.
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References |
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1996.
Cambridge: CMA Medical Data
, 1996.(Accepted 18 March 1999)
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