Publications by authors named "Kaj S Christensen"

Introduction: The Mental Pain Questionnaire (MPQ) was developed using a clinimetric approach to bring together the key features of mental pain into a single, brief, transdiagnostic scale. The present study aims at extending the validation of the MPQ to people from three different clinical settings.

Methods: A multicentre, cross-sectional study on adults diagnosed with migraine (n = 256), systemic sclerosis (n = 219), or mental disorders (n = 138) was conducted.

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Background And Objective: Psychotropic drug use is common in older adults, with off-label use reported despite limited understanding of the safety outcomes compared to on-label use. Incomplete recordings of treatment indications in the Danish National Prescription Register (DNPR) raise concerns about potential off-label medication use, particularly among older adults. We, therefore, investigated the association between psychotropic prescriptions with non-registered indications in DNPR and the 1-year all-cause mortality in older adults, including subgroups with any psychiatric disorders, depression, or dementia.

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Objective: This study aimed to describe depression treatment patterns, identify unique trajectory groups using a group-based trajectory approach, and explore associated social determinants in older adults undergoing first-time depression treatment during a 3-year follow-up.

Methods: This Danish register-based cohort study included all adults aged ≥ 65 who initiated depression treatment by redeeming first-time antidepressant prescriptions (no prescriptions in the last 10 years) between 2006 and 2015. The outcome of interest during the 2-year follow-up was depression treatment, assessed as antidepressant prescriptions redemptions and psychiatric hospital contacts for depression.

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Background: Caring for a family member can be demanding, particularly when caregivers experience profound distress. Supportive interventions may help prevent mental and physical illness in the caregiver. General practice plays a key role by regularly engaging with patients and caregivers, thereby being able to identify their support needs, offer talk therapy and refer to care initiatives.

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Article Synopsis
  • The study examined sociodemographic and clinical factors affecting treatment outcomes in older adults (aged 65+) starting SSRIs for depression in Denmark from 2006-2017.
  • About 40.1% of the 65,741 participants discontinued treatment within a year, with various outcomes linked to factors like gender, rural residence, and existing health conditions.
  • It highlights the need for personalized treatment approaches, as certain demographics significantly influenced the likelihood of unfavorable clinical outcomes.
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Background: Type two diabetes (T2D) is linked to impaired mental health. International guidelines emphasise the importance of including psychological aspects in diabetes care. Yet, no systematic approach has been implemented to assess mental health in patients with T2D in general practice.

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Objective: The aim of this study was to examine the construct validity and reliability of the Self Efficacy (SE-12) questionnaire using Rasch analysis.

Methods: The SE-12 was administered to Danish health care professionals prior to their participation in a communication skills training program. Analysis of fit to the Rasch model, ordering of response categories, dimensionality-testing, test for differential item functioning, test for local dependency, and calculation of reliability were used to evaluate the psychometric characteristics of the SE-12.

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Background: Mental health issues are common among patients with chronic physical conditions, affecting approximately one in five patients. Poor mental health is associated with worse disease outcomes and increased mortality. Problem-solving therapy (PST) may be a suitable treatment for targeting poor mental health in these patients.

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Article Synopsis
  • * An online survey involving 3,398 participants was conducted, applying advanced statistical models to analyze the validity of the PHQ-9, revealing issues with certain items over or under-discriminating depression levels.
  • * Although the PHQ-9 shows potential for screening depression, significant revisions are recommended to improve its effectiveness, especially in the wording of problematic items.
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Background: The Major Depression Inventory (MDI) is a patient-reported outcome measure used by general practitioners to assist with diagnosing and evaluation of the severity of a patient's depression. However, recent studies have questioned the structural validity of the MDI.

Objectives: We proposed a modified version (mMDI) of the MDI with fewer response categories and four rephrased items and aimed to compare the psychometric properties of the changes in a joint cohort of patients from general practice and mental health associations.

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  • This study provides a comprehensive analysis of mental healthcare utilization (MHU) among Danish military personnel who have been deployed (FDP) compared to the general civilian population, incorporating previously overlooked data on psychotherapy services.
  • The research involved 10,971 first-time deployed military personnel returning from missions between 2005 and 2017, matched with a civilian reference group of 253,714 individuals, examining their healthcare records from military and civilian sectors.
  • Results showed that when including military healthcare utilization, FDP had significantly higher MHU rates than civilians, highlighting the importance of considering both civilian and military data when assessing the mental health impact of military deployment.
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Background And Objective: Mental health issues are common among patients with chronic physical conditions. This study aims to evaluate the feasibility of the Healthy Mind intervention, a general practice-based programme that provides problem-solving therapy (PST) to patients with poor mental well-being and type 2 diabetes (T2D) and/or ischaemic heart disease (IHD).

Design And Setting: A one-arm feasibility study was conducted in three general practices in the Central Denmark Region.

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  • The Health Literacy for School-Aged Children (HLSAC) is a tool that measures health literacy in kids and was adapted for adults, resulting in the Brief Health Literacy scale for Adults (B-HLA).
  • A validation study assessed the B-HLA's effectiveness by evaluating its content and structural validity through expert interviews and Rasch analysis.
  • Adjustments were made to improve wording and fit, ultimately demonstrating that the B-HLA is a valid and effective instrument for measuring health literacy in adults.
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  • The Perceived Stress Scale (PSS) is a common tool used to measure perceived stress, featuring ten items with both negative and positive phrasing and generally considered to have two dimensions.
  • The study aimed to analyze the PSS's dimensionality and how item wording affects its measurement properties by comparing it to a modified version that only used negatively worded items (mPSS).
  • Results indicated that while the original PSS generally supports a two-factor model, the mPSS showed better precision and less response bias, suggesting it could be preferable for clinical and research settings.
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Objective: The authors investigated the clinical outcomes of commonly used antidepressants among older adults who initiated first-time antidepressants for depression by analyzing the 1-year risk of selected clinically relevant outcomes.

Methods: This cohort study used nationwide Danish registry data and included all older adults who redeemed a first-time (since 1995) antidepressant prescription with an indication of depression between 2006 and 2017. Only the 10 most frequently redeemed antidepressants were included in the analyses.

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Background: The choice of antidepressants for initial pharmacological treatment of depression in older adults and associated patients' characteristics are understudied. We aimed to describe the first selected antidepressant (first-choice) for depression in older adults (≥65 years) and whether patients' sociodemographic and clinical characteristics influence selecting an alternative first-choice (any other antidepressant than the nationally recommended first-choice sertraline) in Denmark.

Methods: Register-based cross-sectional study including all older adults who redeemed their first antidepressant prescription for depression at community pharmacies in Denmark in 2015-2019.

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Objective: The Patient Health Questionnaire (PHQ-9) and the Major Depression Inventory (MDI) are psychometric instruments frequently used for depression diagnosis and monitoring in primary care settings. The goal of this study was to assess and compare the construct validity of the PHQ-9 and the MDI using Rasch analysis.

Methods: The PHQ-9 and the MDI were distributed in random ordering (first or last) to a waiting room sample of Danish primary care patients.

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Objectives: Off-label prescriptions of antidepressants may be of special concern in older-adults. We aimed to study the potential off-label use of antidepressants among adults ≥65 years by describing the patterns, trends, and factors associated with missing and unspecified treatment indications.

Methods: We used registry data to describe indications of all antidepressant prescriptions (N = 13.

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Background: The time interval from first symptom and sign until a cancer diagnosis significantly affects the prognosis. Therefore, recognising and acting on signs of cancer, such as anaemia, is essential. Evidence is sparse on the overall risk of cancer and the risk of specific cancer types in persons with new-onset anaemia detected in an unselected general practice population.

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Background: The assessment of psychological well-being and euthymia represents an emerging issue in clinical psychology and psychiatry. Rating scales and indices such as the 5-item version of the World Health Organization Well-Being Index (WHO-5) and the Euthymia Scale (ES) were developed but insufficient attention has been devoted to the evaluation of their cross-cultural validity. This is the first study using Clinimetric Patient-Reported Outcome Measures (CLIPROM) criteria to assess cross-cultural validity and sensitivity of five different versions of the WHO-5 and ES.

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Article Synopsis
  • The study evaluated the Anxiety Symptom Scale (ASS) using data from over 16,000 participants aged 18-90, aiming to assess its psychometric properties through Rasch analysis.
  • Results showed that after modifying the scoring system, the ASS fit the Rasch model well, with no significant differences by sex, age, or education level, although some items indicated local dependency.
  • The scale may struggle with reliability for the general population but appears more effective for clinical settings, suggesting that focused applications could enhance its validity in measuring anxiety.
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: This is the first study applying Clinimetric Patient-Reported Outcome Measures (CLIPROM) criteria to evaluate the construct validity, sensitivity, and clinical utility of the SCL-90-R in patients with Parkinson's disease (PD). : A Rasch analysis was conducted using a sample of 488 PD outpatients. Testing for dimensionality revealed that less than 5% of -tests were significant, indicating that the SCL-90-R subscales entailed the property of construct validity.

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Introduction: The recommended treatments for post-traumatic stress disorder (PTSD) are psychological therapies and medication, but the best approach is still discussed. Exposure to traumatic events in psychotherapy tends to cause high drop-out rates. Likewise, little effect or adverse events of medications may lead to attrition.

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Background: Anaemia is associated with adverse outcomes, including increased morbidity and all-cause mortality. Diagnostic workup of patients with anaemia is essential to detect underlying disease, especially undiagnosed malignancy.

Objective: To describe the cancer-relevant diagnostic workup in patients with new-onset anaemia detected in general practice.

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