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Reasons for cannabis use in first-episode psychosis: Does strength of endorsement change over 12 months?

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Reasons for cannabis use in first-episode psychosis : Does strength of endorsement change over 12 months? / Kolliakou, A.; Castle, D.; Sallis, H.; Joseph, C.; O'Connor, J.; Wiffen, B.; Gayer-Anderson, C.; McQueen, G.; Taylor, H.; Bonaccorso, S.; Gaughran, F.; Smith, S.; Greenwood, K.; Murray, R. M.; Di Forti, M.; Atakan, Z.; Ismail, K.

In: European Psychiatry, Vol. 30, No. 1, 01.2015, p. 152-159.

Research output: Contribution to journalArticle

Harvard

Kolliakou, A, Castle, D, Sallis, H, Joseph, C, O'Connor, J, Wiffen, B, Gayer-Anderson, C, McQueen, G, Taylor, H, Bonaccorso, S, Gaughran, F, Smith, S, Greenwood, K, Murray, RM, Di Forti, M, Atakan, Z & Ismail, K 2015, 'Reasons for cannabis use in first-episode psychosis: Does strength of endorsement change over 12 months?' European Psychiatry, vol 30, no. 1, pp. 152-159. DOI: 10.1016/j.eurpsy.2014.10.007

APA

Kolliakou, A., Castle, D., Sallis, H., Joseph, C., O'Connor, J., Wiffen, B., ... Ismail, K. (2015). Reasons for cannabis use in first-episode psychosis: Does strength of endorsement change over 12 months? European Psychiatry, 30(1), 152-159. DOI: 10.1016/j.eurpsy.2014.10.007

Vancouver

Kolliakou A, Castle D, Sallis H, Joseph C, O'Connor J, Wiffen B et al. Reasons for cannabis use in first-episode psychosis: Does strength of endorsement change over 12 months? European Psychiatry. 2015 Jan;30(1):152-159. Available from, DOI: 10.1016/j.eurpsy.2014.10.007

Author

Kolliakou, A.; Castle, D.; Sallis, H.; Joseph, C.; O'Connor, J.; Wiffen, B.; Gayer-Anderson, C.; McQueen, G.; Taylor, H.; Bonaccorso, S.; Gaughran, F.; Smith, S.; Greenwood, K.; Murray, R. M.; Di Forti, M.; Atakan, Z.; Ismail, K. / Reasons for cannabis use in first-episode psychosis : Does strength of endorsement change over 12 months?

In: European Psychiatry, Vol. 30, No. 1, 01.2015, p. 152-159.

Research output: Contribution to journalArticle

Bibtex Download

@article{601aa65eb91044479b492cf8dec031ca,
title = "Reasons for cannabis use in first-episode psychosis: Does strength of endorsement change over 12 months?",
keywords = "Alleviation of dysphoria, Cannabis use, Psychosis, Reasons for cannabis use, Schizophrenia, Self-medication",
author = "A. Kolliakou and D. Castle and H. Sallis and C. Joseph and J. O'Connor and B. Wiffen and C. Gayer-Anderson and G. McQueen and H. Taylor and S. Bonaccorso and F. Gaughran and S. Smith and K. Greenwood and Murray, {R. M.} and {Di Forti}, M. and Z. Atakan and K. Ismail",
year = "2015",
month = "1",
doi = "10.1016/j.eurpsy.2014.10.007",
volume = "30",
pages = "152--159",
journal = "European Psychiatry",
issn = "0924-9338",
publisher = "Elsevier Masson",
number = "1",

}

RIS (suitable for import to EndNote) Download

TY - JOUR

T1 - Reasons for cannabis use in first-episode psychosis

T2 - European Psychiatry

AU - Kolliakou,A.

AU - Castle,D.

AU - Sallis,H.

AU - Joseph,C.

AU - O'Connor,J.

AU - Wiffen,B.

AU - Gayer-Anderson,C.

AU - McQueen,G.

AU - Taylor,H.

AU - Bonaccorso,S.

AU - Gaughran,F.

AU - Smith,S.

AU - Greenwood,K.

AU - Murray,R. M.

AU - Di Forti,M.

AU - Atakan,Z.

AU - Ismail,K.

PY - 2015/1

Y1 - 2015/1

N2 - <p>Background: Why patients with psychosis use cannabis remains debated. The self-medication hypothesis has received some support but other evidence points towards an alleviation of dysphoria model. This study investigated the reasons for cannabis use in first-episode psychosis (FEP) and whether strength in their endorsement changed over time. Methods: FEP inpatients and outpatients at the South London and Maudsley, Oxleas and Sussex NHS Trusts UK, who used cannabis, rated their motives at baseline (n = 69), 3 months (n = 29) and 12 months (n = 36). A random intercept model was used to test the change in strength of endorsement over the 12 months. Paired-sample t-tests assessed the differences in mean scores between the five subscales on the Reasons for Use Scale (enhancement, social motive, coping with unpleasant affect, conformity and acceptance and relief of positive symptoms and side effects), at each time-point. Results: Time had a significant effect on scores when controlling for reason; average scores on each subscale were higher at baseline than at 3 months and 12 months. At each time-point, patients endorsed 'enhancement' followed by 'coping with unpleasant affect' and 'social motive' more highly for their cannabis use than any other reason. 'Conformity and acceptance' followed closely. 'Relief of positive symptoms and side effects' was the least endorsed motive. Conclusions: Patients endorsed their reasons for use at 3 months and 12 months less strongly than at baseline. Little support for the self-medication or alleviation of dysphoria models was found. Rather, patients rated 'enhancement' most highly for their cannabis use.</p>

AB - <p>Background: Why patients with psychosis use cannabis remains debated. The self-medication hypothesis has received some support but other evidence points towards an alleviation of dysphoria model. This study investigated the reasons for cannabis use in first-episode psychosis (FEP) and whether strength in their endorsement changed over time. Methods: FEP inpatients and outpatients at the South London and Maudsley, Oxleas and Sussex NHS Trusts UK, who used cannabis, rated their motives at baseline (n = 69), 3 months (n = 29) and 12 months (n = 36). A random intercept model was used to test the change in strength of endorsement over the 12 months. Paired-sample t-tests assessed the differences in mean scores between the five subscales on the Reasons for Use Scale (enhancement, social motive, coping with unpleasant affect, conformity and acceptance and relief of positive symptoms and side effects), at each time-point. Results: Time had a significant effect on scores when controlling for reason; average scores on each subscale were higher at baseline than at 3 months and 12 months. At each time-point, patients endorsed 'enhancement' followed by 'coping with unpleasant affect' and 'social motive' more highly for their cannabis use than any other reason. 'Conformity and acceptance' followed closely. 'Relief of positive symptoms and side effects' was the least endorsed motive. Conclusions: Patients endorsed their reasons for use at 3 months and 12 months less strongly than at baseline. Little support for the self-medication or alleviation of dysphoria models was found. Rather, patients rated 'enhancement' most highly for their cannabis use.</p>

KW - Alleviation of dysphoria

KW - Cannabis use

KW - Psychosis

KW - Reasons for cannabis use

KW - Schizophrenia

KW - Self-medication

UR - http://www.scopus.com/inward/record.url?scp=84919667841&partnerID=8YFLogxK

U2 - 10.1016/j.eurpsy.2014.10.007

DO - 10.1016/j.eurpsy.2014.10.007

M3 - Article

VL - 30

SP - 152

EP - 159

JO - European Psychiatry

JF - European Psychiatry

SN - 0924-9338

IS - 1

ER -

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