Kyla H. Thomas

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OBJECTIVE To compare the risk of suicide, self harm, and depression in patients prescribed varenicline or bupropion with those prescribed nicotine replacement therapy. DESIGN Prospective cohort study within the Clinical Practice Research Datalink. SETTING 349 general practices in England. PARTICIPANTS 119,546 men and women aged 18 years and over who(More)
OBJECTIVE To determine the risk of neuropsychiatric adverse events associated with use of varenicline compared with placebo in randomised controlled trials. DESIGN Systematic review and meta-analysis comparing study effects using two summary estimates in fixed effects models, risk differences, and Peto odds ratios. DATA SOURCES Medline, Embase,(More)
BACKGROUND Suicide is one of the leading causes of premature mortality worldwide. Few studies have assessed long-term trends or sex differences in its incidence over time. We have investigated the age-, sex- and method-specific trends in suicide in England and Wales from 1861 to 2007. METHODS Overall age-standardized suicide rates using the European(More)
OBJECTIVES To investigate whether physicians' prescribing preferences were valid instrumental variables for the antidepressant prescriptions they issued to their patients. STUDY DESIGN AND SETTING We investigated whether physicians' previous prescriptions of (1) tricyclic antidepressants (TCAs) vs. selective serotonin reuptake inhibitors (SSRIs) and (2)(More)
Estimating gestational age in resource-limited settings is prone to considerable inaccuracy because crown-rump length measured by ultrasound before 14 weeks gestation, the recommended method for estimating gestational age, is often unavailable. Judgements regarding provision of appropriate obstetric and neonatal care are dependent on accurate estimation of(More)
BACKGROUND The impact of newly emerging, popular suicide methods on overall rates of suicide has not previously been investigated systematically. Understanding these effects may have important implications for public health surveillance. We examine the emergence of three novel methods of suicide by gassing in the 20th and 21st centuries and determine the(More)
BACKGROUND Forty percent of the world's suicide deaths occur in low and middle income countries (LAMIC) in Asia. There is a recognition that social factors, such as socioeconomic position (SEP), play an important role in determining suicidal risk in high income countries, but less is known about the association in LAMIC. METHODS The objective of this(More)
OBJECTIVE To investigate changes in the range of suicide methods used in two time periods a century apart (1901-1907 and 2001-2007) in England and Wales. METHOD Suicide mortality and population data were obtained for England and Wales from the ONS and used to calculate gender and method-specific mortality rates. RESULTS There have been striking changes(More)
AIMS The UK Clinical Practice Research Datalink (CPRD) is increasingly being used to investigate suicide-related adverse drug reactions. No studies have comprehensively validated the recording of suicide and nonfatal self-harm in the CPRD. We validated general practitioners' recording of these outcomes using linked Office for National Statistics (ONS)(More)
BACKGROUND Some studies suggest that people who self-cut have a higher risk of suicide than those who self-poison. Self-cutting ranges from superficial wrist cutting to severe self-injury involving areas such as the chest, abdomen and neck which can be life threatening. This study aimed to investigate whether the site of self-cutting was associated with(More)