Gerjo Kok

Gerjo Kok
Maastricht University | UM · Department of Work and Social Psychology

PhD

About

565
Publications
364,407
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24,257
Citations

Publications

Publications (565)
Article
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Introduction: Hypertension (HPT) is recognized as a significant public health problem worldwide from a health and economic perspective. This study determined predictors of nonadherence to HPT medications in Ghana using the health belief model. Methods: A cross-sectional descriptive survey employing a quantitative approach was conducted among HPT...
Article
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Alcohol consumption during pregnancy can lead to fetal alcohol spectrum disorders (FASD). FASD is a spectrum of structural, functional, and neurodevelopmental problems with often lifelong implications, affecting communities worldwide. It is a leading preventable form of intellectual disabilities and therefore warrants effective prevention approache...
Article
The process of developing a behavior change intervention can cover a long time period. However, in times of need, this development process has to be more efficient and without losing the scientific rigor. In this article, we describe the just-in-time, planned development of an online intervention in the field of higher education, promoting COVID-19...
Article
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Background: The Kilimanjaro Diabetic Programme used the Intervention Mapping framework to develop a theory- and evidence-based diabetic retinopathy screening programme. A Working Committee of health care workers and stakeholders ensured community engagement and empowerment of the target audience. Objectives: To deliver a culturally appropriate,...
Article
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Introduction: Intervention Mapping is the protocol used by the Kilimanjaro Diabetic Programme to plan, develop, implement, and evaluate an evidence-based screening programme for diabetic retinopathy. Two comic strips were developed to deliver the message on the need for diabetic retinopathy screening. Objectives: The first objective was to devel...
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Background: Although several COVID-19 vaccines are available, the current challenge is achieving high vaccine uptake. We aimed to explore university students' intention to get vaccinated and select the most relevant determinants/beliefs to facilitate informed decision making around COVID-19 vaccine uptake. Methods: A cross-sectional online surve...
Article
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Halfway through 2021 in the midst of a public health crisis, a new academic year was fast approaching. Dutch universities were preparing to reopen their campuses to students and personnel in a safe manner. As the vaccination uptake was increasing and societies were slowly reopening, inviting students and personnel to campus became the next step to...
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Abstract Rationale: Translating research evidence into clinical practice to improve care involves healthcare professionals adopting new behaviours and changing or stopping their existing behaviours. However, changing healthcare professional behaviour can be difficult, particularly when it involves changing repetitive, ingrained ways of providing ca...
Article
In recent years, the research on human behaviour in relation to waste management has increased at an exponential rate. At the same time, the expanding academic literature on this topic makes it more difficult to understand the main areas of interest, the leading institutions and authors, the possible interconnections among different disciplines, an...
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Background Sedentary behaviour (SB) affects cardiometabolic health and quality of life (QoL). We examine the effects of UPcomplish, a 12-week data-driven intervention, on SB, QoL and psychosocial determinants among office workers. Methods Participants were recruited via judgement sampling. Five groups starting with time-lags of 7 weeks ( n = 142,...
Article
This study aims to explore the factors influencing the implementation of the social-emotional learning pilot program Me and My new World, which emphasizes enhancing personal capacities toward equal personal relationships and behaviors of adolescents in Panama. Since the effect assessment of the program showed improved personal capacities of adolesc...
Research
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We examined the degree and direction of sexual desire discrepancies (SDD) between partners and how this relates to sexual function, sexual satisfaction, relationship satisfaction in 100 Saudi Arabian couples, taking into account both partners' attachment orientation. Men and women reported better outcomes when they matched on higher levels of sexua...
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Background Hypertension has become an important public health concern in the developing world owing to rising prevalence and its adverse impact on ailing health systems. Despite being a modifiable risk factor for cardiovascular disease, hypertension has not received the needed attention in Ghana as a result of various competing interests for scarce...
Article
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Background When reopening universities in times of COVID-19, students still have to adhere to COVID-19 behavioral guidelines. We explored what behavioral determinants (and underlying beliefs) related to the adherence to guidelines are both relevant and changeable, as input for future interventions. Methods A cross-sectional online survey was condu...
Preprint
We describe the just-in-time, planned development of an online intervention promoting COVID-19-vaccination among University students, just before they were eligible for being vaccinated. We applied the six steps of Intervention Mapping within a time frame much shorter than usual, without losing scientific rigor. In step 1, we created a logic model...
Article
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Objective: This study aims to explore students’ adherence and reasons behind the (non)adherence to the COVID-19-regulations within a university setting. Methods: A total of 33 students participated in on-site and online focus group interviews (k = 8). Discussed topics included the general COVID-19-guidelines of the university, including keeping ≥1....
Article
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Current research funding models for health psychologists tend to be biased toward support for large-scale ‘definitive’ behavioural trials. This approach emphasizes rigorous tests of one or more key questions, but, unintentionally, may lead to the funding of interventions that are based on myriad untested assumptions. We propose that future funding...
Preprint
Objective: Although several COVID-19 vaccines are available, the current challenge is achieving high vaccine uptake. We aimed to explore university students’ intention to get vaccinated and select the most relevant determinants/beliefs to facilitate informed decision-making around COVID-19 vaccine uptake.Methods: A cross-sectional online survey wit...
Article
Full-text available
Background Hypertension (HPT) is an essential public health problem affecting both lower and middle-income countries disproportionately. Evidence suggests that HPT is the leading risk factor for cardiovascular diseases and chronic kidney disease. Yet, challenges faced by patients with HPT in Ghana are not sufficiently explored. This study, document...
Article
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Introduction This study is one of the first to examine the association between relationship and sexual variables as approached from a dyadic perspective in Saudi Arabian couples. Theoretical models assign an important role to relationship factors in women's sexuality. Aim We examined the role of sexual and relationship satisfaction relative to sex...
Article
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To improve sexual health among people living with HIV, sexual health should be addressed during consultations in routine HIV care. The aim of the present study was to investigate to what extent Sexual Health Counselling (SHC) is incorporated into routine Dutch HIV care and to explore differences between physicians and nurses in their practices and...
Preprint
Objective: When reopening universities in times of COVID-19, students still have to adhere to COVID-19 behavioral guidelines. We explored what behavioral determinants (and underlying beliefs) related to the adherence to guidelines are both relevant and changeable, as input for future interventions.Design: A cross-sectional online survey was conduct...
Preprint
Objective. This study aims to explore students’ adherence and reasons behind the (non)adherence to the COVID-19-regulations within a university setting.Methods. A total of 33 students participated in on-site and online focus group interviews (k=8). Discussed topics included the general COVID-19-guidelines of the university, including keeping ≥1.5 m...
Article
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Background: In this paper, a series of studies investigating one of the parameters for effectiveness in relation to using arguments in persuasive communication messages is described: the novelty of arguments. Method: The first study involves the elicitation of arguments, the second study entails the identification of novel arguments, and the third...
Article
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Background Self-identity has frequently been proposed as a useful addition to the Theory of Planned Behavior; yet Fishbein and Ajzen decided to not include self-identity when they published that theory’s successor, the Reasoned Action Approach. One of their reasons for exclusion is the lack of clear conceptual independence, as manifested in self-id...
Article
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Background: Hookah smoking is an emerging global health issue, especially in Eastern Mediterranean region; and accordingly, women are at the center of this issue as they have a more positive attitude towards hookah smoking. Also, the rate of hookah smoking is increasing at a faster rate among women compared to men. The aim of the present study wil...
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Purpose This study describes the development of an evidence-based intervention to create a supportive work environment for employees with chronic conditions. Occupational physicians (OPs) play an important role in guiding organizations in this process of organizational change. Supportive work environments can aid in preventing work-related problems...
Article
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The article describes a position statement and recommendations for actions that need to be taken to develop best practices for promoting scientific integrity through open science in health psychology endorsed at a Synergy Expert Group Meeting. Sixteen Synergy Meeting participants developed a set of recommendations for researchers, gatekeepers, and...
Article
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Adolescents in Panama face multiple barriers that affect their health, such as high rates of teenage pregnancy, increased human immunodeficiency virus (HIV) infections and sexual violence. Equal relationships between women and men are likely to reduce such risks. Here, we suggest that the school-based enhancement of Social and Emotional Learning co...
Article
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Gender inequalities still affect the health and well-being of young people worldwide. Given the apprehensions among government and educators in a conservative context like Panama to implement comprehensive sexual education, there is a need for other educational efforts to stimulate healthy and respectful intimate relationships between adolescents....
Article
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Background: Since desk-dominated work environments facilitate sedentary behavior, office workers sit for 66% of their working days and only 8% succeed in interrupting their prolonged periods of sitting within the first 55 minutes. Yet stretches of long and uninterrupted sitting increase the likelihood of several chronic metabolic and cardiovascular...
Article
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Although there has been a steady increase in the number of studies on consumer behaviour in relation to sustainable development, there is limited focus on the product disposal phase. This systematic literature review intends to: (1) clarify how concepts related to pro-environmental consumer behaviour are understood and analysed in the academic lite...
Article
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The aim of the study was to establish demographically representative norms for tasks measuring goal setting, and more specifically planning and reasoning in children. Three tasks were administered to n = 195 Ukrainian children aged 5.10 to 14.5 years old: the Spatial Working Memory (SWM), the Stockings of Cambridge (SOC) test, and the Naglieri Nonv...
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Background Attachment and intimacy play an important role in shaping sexual and relational experiences. Yet, their interrelation has rarely been investigated in the context of sexual problems and never been tested in Saudi Arabian women. Aim The present study examined the interrelations of attachment orientation and sexual function, distress, sati...
Article
Background: Hookah smoking has been increasingly popular in Iran within the last two decades. The present study aims to explain the determinants of hookah smoking cessation among southern Iranian women in Bandar Abbas. Methods: The present study is a pioneering qualitative research that employed a conventional content analysis to explore factors af...
Article
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Background: Unhealthy alcohol use is a public health issue, prioritized by the World Health Organization (WHO) for prevention and reduction. Ukraine falls in the highest WHO category of “years of life lost” due to alcohol use. Objective: To investigate perceptions of alcohol consumption in a sample of youth and adults in western Ukraine. Methods: I...
Article
Introduction Fetal alcohol spectrum disorders (FASD) is an important preventable public health concern, associated to a number of common pediatric problems such as incontinence. Little is known about the prevalence and presentation of incontinence in FASD, which hinders effective management. Objective The aim of the present study was to investigat...
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Abstract Background: The prevalence of hookah consumption has been on the increase in Iran over the past two decades. This rate is higher among women than men in the south of Iran than other geographical areas. The purpose of this study was to explain the determinants of hookah consumption among indigenous women of Bandar Abbas city, southern Iran....
Article
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Adolescents in Panama face multiple challenges to their sexual health, rights and well-being such as high rates of teenage pregnancy (∼30% of all pregnancies), increased HIV infections and sexual violence. In the absence of sufficient evidence-based data and an ongoing debate in Panamanian society about how to approach adolescents' health problems,...
Article
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Background: The development of school-based programs for preventing adolescent sexual harassment often lacks an evidence-based approach and use of proper theories. Appropriate stakeholders are often not involved in the development process. To help improve this process, we used the Intervention Mapping framework to retrospectively evaluate the deve...
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Understanding the perceptions of health and sickness can help the government, health providers and health promoters encourage individuals to participate in healthy behaviors and to follow a healthy lifestyle. Jakarta, the capital city of Indonesia, is a culturally, socially and financially diverse city, with complex health care needs. As yet, there...
Article
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The study aims to establish demographically corrected norms for three computerized tasks measuring different aspects of visual short-term memory (VSTM) in Ukrainian schoolchildren. These tasks measure respectively visual STM (the Pattern Recognition Memory (PRM) test), spatial STM (the Spatial Span (SSP) task), and visual spatial STM (the Paired As...
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Health Care Services (HCSs) should implement ongoing innovation and continuously improve their quality. However, in evaluating the quality of HCSs, too little attention has been given to the experience of the users concerning the acquired services. This study focused on how the community values the current services in order to improve HCSs in Indon...
Article
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Evidence-informed health intervention planning that incorporates theoretical and empirical evidence and engages key stakeholders and community members or patients in the planning process results in interventions that are more effective. Nevertheless, exactly how and when to use evidence, theory, and community-based participation during planning rep...
Article
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Introduction The present study aimed to determine factors associated with hookah smoking among women on a global scale based on a systematic review of related literature. Intervention Mapping was the guiding framework for this review. Methods Searches were performed in Web of Science, PubMed, Iranian databases, Elsevier, Embase, Scopus, Medline, G...
Article
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The study aims to establish demographically corrected, pediatric norms for the computerized Delayed Matching to Sample (DMS) test, a measure of “visual matching ability and short-term visual recognition memory, for non-verbalisable problems”. The DMS was administered to n = 184 children aged 5.10 to 14.5 years old. The DMS is a 4-choice recognition...
Article
Purpose: To explore the factors influencing adherence to home-based exercises among community-dwelling stroke survivors using Intervention Mapping approach. Material and methods: Qualitative interviews were conducted with ten stroke survivors living in semi-urban regions of India. The data were analyzed using Atlas.Ti8 software and categorized usi...
Article
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Background: The ultimate impact of a health innovation depends not only on its effectiveness but also on its reach in the population and the extent to which it is implemented with high levels of completeness and fidelity. Implementation science has emerged as the potential solution to the failure to translate evidence from research into effective p...
Preprint
BACKGROUND Since desk-dominated work environments facilitate sedentary behavior, office workers sit for 66% of their working days and only 8% succeed in interrupting their prolonged periods of sitting within the first 55 minutes. Yet stretches of long and uninterrupted sitting increase the likelihood of several chronic metabolic and cardiovascular...
Preprint
Full-text available
Background: The consumption of hookah is rising around the world, especially among women, due to social acceptance and a positive attitude. It is also necessary and inevitable to identify the factors that lead to a decrease in this upward trend. The present study aims to explain the determinants of cessation or reduction of hookah consumption among...
Article
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Individuals with an intellectual disability (ID) have sexual feelings, are sexually active and have ideas about sexuality. There is limited information available about the ideas and experiences regarding sexual expression, interests and knowledge of sexual rights in this population. This study aims to identify the ideas, expressions, barriers to se...
Article
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Background While existing psychological treatments for depression are effective for many, a significant proportion of depressed individuals do not respond to current approaches and few remain well over the long-term. Anhedonia (a loss of interest or pleasure) is a core symptom of depression which predicts a poor prognosis but has been neglected by...
Article
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Purposes Intervention Mapping (IM) is a protocol for developing effective behavior change interventions. It has been used for 10 years to develop work disability prevention (WDP) interventions, but it is not known to what extent and with what success. The main objective of this study was to review the effectiveness of these interventions. Secondary...
Preprint
Full-text available
Self-identity has frequently been proposed as a useful addition to the Theory of Planned Behavior; yet Fishbein and Ajzen decided to not include self-identity when they published that theory’s successor, the Reasoned Action Approach. One of their reasons for exclusion is the lack of clear conceptual independence, as manifested in self-identity oper...
Article
Full-text available
Recycling waste is important to reduce the production of greenhouse gasses. The aim of this project was to understand determinants of cafeteria waste separation behavior among university students. First, the determinants of waste separation behavior among university students (n = 121) were explored using an online questionnaire. In study 2 (pre-/po...
Preprint
Background Fetal Alcohol Spectrum Disorders (FASD) is an important global health problem in need of prevention. For FASD prevention it is important to understand why pregnant women engage or do not engage in drinking alcohol. It remains unknown which psychosocial determinants related to maternal alcohol consumption are most in need of prevention. T...
Article
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Experiences of sexual prejudice threaten the quality of life and psychological well-being of sexual minority youth. The aim of this paper is to provide a comprehensive overview of how we developed a theory- and evidence-based sexual prejudice reduction program suitable for the Dutch high school context, guided by the intervention mapping approach (...
Article
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Objectives Fetal alcohol spectrum disorders (FASD) is a worldwide problem. Maternal alcohol consumption is an important risk factor for FASD. It remains unknown which alcohol consumption patterns most strongly predict FASD. The objective of this study was to identify these. Design Systematic literature review. Methods We searched in PubMed, Psych...
Preprint
Full-text available
Objectives: Fetal Alcohol Spectrum Disorders (FASD) is a worldwide problem. Maternal alcohol consumption is an important risk factor for FASD. It remains unknown which alcohol consumption patterns most strongly predict FASD. The objective of this study was to identify these.Design: Systematic literature review.Methods: We searched in PubMed, PsychI...