Adults with mental illnesses are at an increased risk to be diagnosed with one or more comorbid physical illnesses compared to the general population. Much of the disparities faced by adults with serious mental illnesses (SMI) can be attributed to medication side effects, increased risk for metabolic diseases, inability to communicate about severity and monitor physical health symptoms, poor health behaviors, high rates of smoking, and poor quality health care. The rate of physical illnesses for adults with mental illnesses are even higher among those who have been involved with the criminal justice system. In order to understand the relationship between physical and mental illnesses, longitudinal study designs are needed. Longitudinal studies can provide greater understanding of the temporal relationship of physical and mental illnesses. Despite the benefits of longitudinal studies, there also are challenges, including missing data. The first manuscript of this dissertation explores the physical and mental health status of adults with mental illnesses. Secondary data were used from three different studies: a sample of adults with SMI enrolled in a mental health court jail diversion program (n=91); a sample of Medicaid enrollees with SMI in Florida (n=688) who were part of a larger Substance Abuse and Mental Health Services Administration (SAMHSA) study; and a sample of inpatient and outpatient adults with SMI from five different study sites (n=969). The samples were combined into two data sets, consisting of the jail diversion sample and the SAMHSA sample, and the jail diversion sample and the 5-site sample. Participants in these samples answered questions on the Short-Form Health Survey (SF-12), recent arrests, drug and alcohol use, socio-demographic information, and mental illness symptom severity (measured only in the criminal justice and 5-site samples). Overall, the mental and physical health status scores were significantly lower for all of the participants compared to the general population mean scores. The participants reporting a recent arrest had a higher physical health score compared to those who did not have a recent arrest, and in the jail diversion and 5-site sample, had a lower mental health status score than those without a recent arrest. After taking age, drug and alcohol use, and psychiatric symptom severity into account, arrest was no longer associated with the physical health status score in either of the data sets. In the jail diversion and 5-site data set, arrest was still significantly associated with mental health status score after controlling for age, drug and alcohol use, and psychiatric symptom severity. The second manuscript of this dissertation explores the analysis of missing data in a longitudinal study to determine the missing data mechanisms and missing data patterns, and subsequently, how to prepare the data for analysis by using multiple imputation or maximum likelihood estimation. Secondary data were drawn from the same jail diversion sample as in the first manuscript. Data were collected at baseline, three months, six months, and nine months. Only participants with the potential to have data collected at these time points were included (n=50). Analysis revealed missing data due to missing item-level information, missing participant data at one time point but complete data at a subsequent time point, and missing participant data for those who dropped out of the study completely. The missing data mechanism for the missing item-level data were missing completely at random, whereas the participant-level missing data were missing at random. Multiple imputation was used for the item-level data and for the participant-level missing data. Maximum likelihood estimation was also used for the participant-level missing data and compared to the multiple imputation results. Findings suggest that multiple imputation produced more accurate parameter estimates, possibly due to the small sample size. The findings from this study indicate that more research needs to be done to fully understand the physical illnesses experienced by adults with mental illnesses who are involved with the criminal justice system. Understanding mental and physical illness comorbidity is important in public health as it dictates appropriate treatments and training for behavioral health practitioners and staff. In addition, missing data in longitudinal studies cannot be ignored, as it can bias the results, and appropriate techniques for exploring the missing data must be used. When missing data is ignored in analyses, the subsequent results can be incorrect and unable to detect treatment effects, thereby preventing effective programs from receiving necessary funding. In addition, ignoring missing data can impact funding for behavioral health services by underestimating the prevalence and severity of mental illnesses. Future research should focus on exploring how mental and physical health are related in adults with a recent arrest compared to the general population, and ways to integrate services to address both mental and physical health.

Social phobia is a common disorder associated with significant psychosocial impairment, representing a substantial public health problem largely determined by the high prevalence, and the lifelong chronicity. Social phobia starts in early childhood or adolescence and is often comorbid with depression, other anxiety disorders, alcohol and substance abuse or eating disorders. This cascade of comorbidity, usually secondary to social phobia, increases the disability associated with the condition. The possibility that social phobia may be a trigger for later developing comorbid disorders directs attention to the need for early effective treatment as a preventive measure. The most recent drug class to be investigated for the psychopharmacological treatment of social phobia is the SSRI group for which there is growing support. The other drug classes that have been evaluated are monoamine oxidase inhibitors (MAOIs), benzodiazepines, and beta-blockers. The SSRIs represent a new and attractive therapeutic choice for patients with generalized social phobia. Recently the first, large scale, placebo-controlled study to assess the efficacy of drug treatment in generalized social phobia has been completed with paroxetine. Paroxetine was more effective in reducing the symptoms than placebo and was well tolerated. Many now regard SSRIs as the drugs of choice in social phobia because of their effectiveness and because they avoid the problems of treatment with benzodiazepines or classical MAOIs.

Bakgrund: Antalet äldre ökar vilket utgör en stor utmaning för samhället. Nationella satsningar pågår för att åstadkomma en sammanhållen vård och omsorg för de multisjuka äldre. Syfte: Att beskriva primärvårdsläkares och kommunala sjuksköterskors erfarenheter av samverkan för multisjuka äldre i ordinärt boende samt vilka faktorer de anser viktiga för att förebygga inläggning i slutenvården. Metod: Kvalitativ metod med fokusgruppsintervjuer där sammanlagt 15 sjuksköterskor och läkare deltog. Materialet analyserades med systematisk textkondensering. Resultat: Informanterna anser att flera faktorer påverkar om de multisjuka äldre kan vårdas kvar hemma, samverkan mellan primärvårdsläkare och kommunala sjuksköterskor utgör en viktig del men ansvaret för en allt högre medicinsk nivå i ordinärt boende kräver också andra resurser. En medicinsk vårdplanering underlättar men eftersom de mest sjuka äldres tillstånd snabbt kan förändras behöver de regelbundna hembesök. Detta är en förutsättning för att den medicinska säkerheten ska tryggas, särskilt efter utskrivning från slutenvården.  En utebliven planering och bristande information till patient och närstående ökar risken för sjukhusinläggningar som hade kunnat undvikas. Med ytterligare ersättning för att prioritera multisjuka äldre kan fler hembesök göras. De multisjuka äldres speciella behov ställer ökade krav på personalens kompetens.  Slutsats: Det finns ett engagemang för de multisjuka äldre och förslag på lösningar för att undvika slutenvård och återinläggningar både inom den egna organisation och i samverkan med vårdgrannar. De satsningar som görs nationellt och lokalt behöver utformas tillsammans med de läkare och sjuksköterskor som är närmast patienten för att tillvarata deras kompetens och erfarenhet. Först då kan rätt satsningar komma de multisjuka äldre till del. / Background: The ageing population has increased, which is a major challenge. National efforts are underway to develop coherent care for frail old people. Objective: To describe primary care physicians and community nurses' experiences of interaction for frail old people in home care, and the factors they consider important in preventing readmission. Methods: Qualitative methodology with focus groups involving 15 nurses and doctors. The material was analysed with systematic text condensation. Results: The informants consider that many factors determine whether the frail old people can stay in home care, collaboration between physicians and nurses is important but the responsibility for an increasing medical level in home care also require other resources. A medical healthcare planning facilitates but the frail old patient’s medical condition may change rapidly, regular home visits are needed. This is a prerequisite to ensure medical safety, particularly after discharge from inpatient care. Lack of planning and information to patients and their relatives increases the risk of readmission that could have been avoided. With additional compensation to prioritize the frail elderly, more home visits can be made. The frail old people’s special needs places increased demands on the staff skills. Conclusion: There is a commitment to the frail old people and suggestions for ways to avoid hospitalization and readmissions both within their own organization and in collaboration with healthcare neighbours. The efforts that are being made nationally and locally need to be in collaboration with the doctors and nurses who are closest to the patient to benefit from their skills and experiences. Only then, the right ventures can be made to benefit the frail old people.

Background and Objectives: To describe patterns of healthcare utilization among patients with generalized anxiety disorder (GAD) in general practitioner (GP) settings in Germany. Methods: Using a large computerized database with information from GP practices across Germany, we identified all patients, aged > 18 years, with diagnoses of, or prescriptions for, GAD (ICD-10 diagnosis code F41.1) between October 1, 2003 and September 30, 2004 ("GAD patients"). We also constituted an age- and sex-matched comparison group, consisting of randomly selected patients without any GP encounters or prescriptions for anxiety or depression (a common comorbidity in GAD) during the same period. GAD patients were then compared to those in the matched comparison group over the one-year study period. Results: The study sample consisted of 3340 GAD patients and an equal number of matched comparators. Mean age was 53.2 years; 66.3% were women. Over the 12-month study period, GAD patients were more likely than matched comparators to have encounters for various comorbidities, including sleep disorders (odds ratio [OR] = 6.75 [95% CI = 5.31, 8.57]), substance abuse disorders (3.91 [2.89, 5.28]), and digestive system disorders (2.62 [2.36, 2.91]) (all p < 0.01). GAD patients averaged 5.6 more GP encounters (10.5 [SD = 8.8] vs 4.9 [5.7] for comparison group) and 1.4 more specialist referrals (2.3 [2.9] vs 0.9 [1.7]) (both p < 0.01). Only 58.3% of GAD patients received some type of psychotropic medication (i.e., benzodiazepines, antidepressants, and/or sedatives/hypnotics). Conclusions: Patients with GAD in GP practices in Germany have more clinically recognized comorbidities and higher levels of healthcare utilization than patients without anxiety or depression.

This article reports the results of a cross-national investigation of patterns of comorbidity between substance use and psychiatric disorders in six studies participating in the International Consortium in Psychiatric Epidemiology. In general, there was a strong association between mood and anxiety disorders as well as conduct and antisocial personality disorder with substance disorders at all sites. The results also suggest that there is a continuum in the magnitude of comorbidity as a function of the spectrum of substance use category (use, problems, dependence), as well as a direct relationship between the number of comorbid disorders and increasing levels of severity of substance use disorders (which was particularly pronounced for drugs). Finally, whereas there was no specific temporal pattern of onset for mood disorders in relation to substance disorders, the onset of anxiety disorders was more likely to precede that of substance disorders in all countries. These results illustrate the contribution of cross-national data to understanding the patterns and risk factors for psychopathology and substance use disorders.

Der Langzeitverlauf und die Häufigkeit sogenannter spontaner Remissionen wurde anhand von 77 Fallen mit einer Lifetime-Diagnose einer Angststörung untersucht. Die 77 Angstfälle wurden als Teil der Münchner Follow-up-Studie im Rahmen einer allgemeinen Bevölkerungsuntersuchung im Jahre 1974 identifiziert und wurden über einen Zeitraum von sieben Jahren (bis 1981) weiter untersucht. Die Diagnosen wurden einerseits durch ein standardisiertes diagnostisches Instrument (den DIS), andererseits über eine klinisch-psychiatrische Nachuntersuchung (1981) abgesichert. In Ergänzung hierzu wurde der Verlauf der psychopathologischen Symptome sowie die psychologische und psychosoziale Integration der Versuchspersonen beurteilt. Ergebnisse: Die Lebenszeit-Prävalenz, irgendeine Anststörung zu entwickeln, betrug 13,9%. Einfache und soziale Phobien wiesen eine Prävalenz von 8,0%, Agoraphobie von 5,7%, Zwangsstörungen von 2,0% und Panikstörungen von 2,4% auf. Die Inzidenz, d.h. das Auftreten neuer Fälle im Zeitraum zwischen der Erst- und Zweituntersuchung war niedrig, mit Ausnahme für Panikstörungen (1,2%, bei einer Gesamtprävalenz von 2,4%) und Agoraphobie (1,3% bei einer Gesamtprävalenz von 5,7%). Die Komorbidität war sowohl innerhalb der Angststörungen wie auch bezüglich anderer psychischer Störungen erhöht. 62% hatten mehr als eine Angstdiagnose, Major Depression und Abhängigkeit von Alkohol oder Medikamenten waren die häufigsten komorbiden Störungen, die in der überwiegenden Mehrzahl deutlich nach dem Beginn der Angststörung auftraten. Spontanremissionen wurden auf drei unterschiedlichen Ebenen definiert, von denen ein Kombinationsmaβ als Hauptergebnis interpretiert wurde. Danach war die symptomatische Remission in alien Angstgruppen niedrig, während die psychosoziale Remissionsrate ein günstigeres Bild mit Remissionsraten zwischen 28,6% für Panikstörung und 53,1% für einfache und soziale Phobien ergab. Das kombinierte spontane Remissionsmaβ ergab für keine der Zwangsstörungen, nur 14,3% der Panikstörungen, 19,2% der Agoraphobien und 18,8% der einfachen und sozialen Phobie eine voile Remission. Die Ergebnisse unterstreichen, daβ Angststörungen zumeist in der Kindheit oder frühen Adoleszenz beginnen und dazu neigen, chronisch über den Groβteil des Lebens zu persistieren und nur selten zu remittieren.

Panikattacken sind mit einer Lebenszeitprävalenz von ungefähr 15% ein relativ häufiges Phänomen im Gegensatz zu einer vollen Panikstörung, die eine Prävalenz von 2,3–3% aufweist. In der vorliegenden epidemiologischen Untersuchung (n = 481) einer bundesweiten repräsentativen Stichprobe wurde geprüft, ob früh (vor dem 25. Lebensjahr) und spat auftretende Panikattacken sich hinsichtlich Symptomatik, Verlaufs- und Komorbiditätsmustern unterscheiden. Neben einer erhöhten Angstsymptomatik, insbesondere bezüglich respiratorischer Beschwerden und der Angst zu sterben, zeigte sich bei Panikattacken mit spätem Beginn ein erhöhtes Risiko für Multimorbidität. Auch entwickelten sich bei dieser Gruppe komorbide Bedingungen schneller. Dagegen waren Panikattacken mit frühem Beginn und einem erhöhten Risiko für Agoraphobie sowie phobische Störungen verbunden. Die Ergebnisse werden im Hinblick auf pathogenetische Mechanismen und Implikationen für die Planung therapeutischer Interventionen diskutiert.

Concerns have been raised that the DSM-IV requirements of 6-month duration, excessive worry, and three associated symptoms exclude a substantial number of people with clinically significant anxiety from a diagnosis of generalized anxiety disorder (GAD). We examined the implications of relaxing these three criteria for the estimated prevalence and predictive validity of GAD using nationally representative data from the US National Comorbidity Survey Replication. Relaxing all three criteria more than doubles the estimated prevalence of GAD. Broadly defined GAD significantly predicts the subsequent first onset of a wide range of temporally secondary disorders. The odds of secondary disorders are somewhat smaller for broadly defined than DSM-IV GAD, though few of these differences are statistically significant. Results suggest that subthreshold manifestations of GAD are significantly related to elevated risk of subsequent psychopathology. Further research is needed to determine whether broadening the current diagnostic criteria results in a more valid characterization of GAD.

The role of comorbidity as a risk for suicide attempts is investigated in a random sample of 3021 young adults aged 14–24 years. The M-CIDI, a fully standardized and modified version of the Composite International Diagnostic Interview, was used for the assessment of various DSM-IV lifetime and 12-month diagnoses as well as suicidal ideation and suicide attempts. Of all suicide attempters, 91% had at least one mental disorder, 79% were comorbid or multimorbid respectively and 45% had four or more diagnoses (only 5% in the total sample reached such high levels of comorbidity). Suicide attempters with more than three diagnoses were 18 times more likely (OR = 18.4) to attempt suicide than subjects with no diagnosis. Regarding specific diagnoses, multivariate comorbidity analyses indicated the highest risk for suicide attempt in those suffering from anxiety disorder (OR = 4.3), particularly posttraumatic stress disorder followed by substance disorder (OR = 2.2) and depressive disorder (OR = 2.1). Comorbidity, especially when anxiety disorders are involved, increases the risk for suicide attempts considerably more than any other individual DSM-IV diagnoses.

Auf der Grundlage der DETECT-Studie wird die querschnittliche Assoziation depressiver Störungen mit einem weiten Spektrum körperlicher Erkrankungen in einer bundesweit repräsentativen Stichprobe von 51.000 Patienten aus der primärärztlichen Versorgung in Deutschland sowie der Zusammenhang mit gesundheitsbezogener Lebensqualität und Arbeitsunfähigkeit untersucht. Das Vorliegen einer Depression wurde über den Depression Screening Questionnaire (DSQ) mit seinem ICD-10 Algorithmus ermittelt. Bei einer Gesamt-Querschnittsprävalenz depressiver Störungen von 7,5 % ergaben sich erhöhte Depressionsraten und signifikante Assoziationen für nahezu alle untersuchten Krankheitsgruppen. (1) Ko- und Multimorbidität somatischer als auch somatischer mit depressiven Störungen sind die Regel: „Reine“ (nicht komorbide) Depressionen sind ebenso wie reine somatische Erkrankungen die Ausnahme. (2) Das Depressionsrisiko steigt stetig mit der Anzahl komorbider Krankheiten. (3) Besonders ausgeprägte Assoziationen ergaben sich für schwergradige Herzinsuffizienzen (OR: 5,8), diabetische Folgekomplikationen (OR: 1,7–2,0), koronare Herzerkrankungen (KHK) (OR: 1,7), zerebrale Insulte (OR: 2,5) sowie muskuloskelettäre Erkrankungen (OR: 1,5). Demgegenüber waren z. B. die Raten bei Hyperlipidämie (OR: 1,1) nur leicht erhöht. (4) Komorbide Depression und steigende Multimorbidität waren mit stetig zunehmenden Arbeitsunfähigkeits- raten und absinkender gesundheitsbezogener Lebensqualität assoziiert. Angesichts der quantitativen Bedeutung der Depression sowie des mit Multimorbidität drastisch ansteigenden Depressionsrisikos und der damit verbundenen hohen direkten und indirekten Krankheitslast für das Gesundheitssystem und die Gesellschaft ist das hohe Ausmaß der Unterschätzung von Depression in der Routineversorgung besorgniserregend. / As part of the DETECT study, a nationwide representative clinical-epidemiological study, the frequency and associated problems of comorbid depression with a wide range of somatic illnesses were studied in N = 51,000 primary care patients. Further the association with health related quality of life and disability is examined. Depression was assessed with the Depression Screening Questionnaire (DSQ) with an ICD-10 algorithm. Results: (1) 7.5 % of all primary care patients met criteria for ICD-10 depressive disorders. (2) Depression risk was increased whenever any somatic disorder was present and increased in a dose-response relationship by number of comorbid conditions. (3) Elevation of depression risk was fairly independent of type of diagnosis, although associations with coronary heart disease (OR: 1.7), diabetic complications (OR: 1.7– 2.0), stroke (OR: 2.5) and pain-related chronic disorders (OR: 1.5) were particularly pronounced. Moderate associations were found for hyperlipidaemia (OR: 1.1). (4) Associated with the increasing number of comorbid conditions, patients with comorbid depression had increasingly more disability days and lower health related quality of life. It is concluded that the degree to which the frequency and the deleterious effects of comorbid depression is underestimated and unrecognized is alarming. The use of comorbidity indices might improve recognition.