The relationship between problematic internet use and attention deficit, hyperactivity and impulsivity: A meta-analysis.

OBJECTIVE: This study aimed to investigate the relationship between problematic internet use (PIU) and ADHD-related symptoms of attention deficit, impulsivity and hyperactivity. METHODS: We chose a meta-analytical approach and searched for relevant studies in different databases (Pubmed, PsycInfo, Google scholar). We identified 24 studies with 18 859 participants (mean age = 18.40 (SD = 5.51)) published between 2004 and 2021 which were applicable for our research. We calculated 21, 7, and 9 effect sizes for attention deficit, hyperactivity and impulsivity, respectively. RESULTS: We found significant associations between PIU and attention deficit (r = 0.36, 95% confidence interval = [0.28 to 0.43]), hyperactivity (r = 0.44, 95% confidence interval = [0.33 to 0.53]), and impulsivity (r = 0.41, 95% confidence interval = [0.30 to 0.51]), p < .001 for all three. The effect sizes of attention deficit and hyperactivity were significantly higher in male compared to female participants. Additionally, higher attention deficit effects were found in adults compared to children/adolescents. CONCLUSIONS: Our meta-analysis indicates that ADHD-related symptoms are associated with PIU. Although cross-sectional analyses cannot explain cause-and-effect relationships, we hypothesize that attention deficit, hyperactivity and impulsivity constitute a vulnerability towards PIU.

Manganese exposure and cognitive performance: A meta-analytical approach.

Occupational manganese exposure is associated with serious health concerns, ultimately leading to an illness called manganism. Competing meta-analytic results were published over a decade ago, ranging from undetectable to serious effects on cognitive performance among working adults. Novel studies and findings about the relationship between occupational manganese and cognitive functions have been proposed since. First of all, a systematic literature search was carried out until October 2022 via multiple electronic databases investigating the relationship between occupational manganese exposure and cognitive functions. Differences between the exposure and control groups in cognitive testing were synthesized by effect size Hedge's g. A random effects model was deployed with a restricted likelihood estimator using Hedges' invariance weighting. Publication bias, p-hacking and exposure-effect relationships were investigated. We included 18 studies with 75 effect sizes comparing n = 888 controls and 1092 exposed participants. After exclusion of outliers, we found significantly lower performances in processing speed, attention, working memory, reaction time, cognitive control and visual attention in workers exposed to manganese. Regression analysis revealed an indication of exposure-effect relationships between manganese exposure and cognitive functioning in exposed workers. We provide results of impaired cognitive functions for working adults exposed to manganese in processing speed, attention, working memory, reaction time and visual attention. Indications of quadratic exposure-effect relationships are discussed. We provide several recommendations for further studies to investigate possible exposure effects in the context of occupational health and safety.

The association between problematic smartphone use and symptoms of anxiety and depression-a meta-analysis.

BACKGROUND: Recent research links problematic smartphone use (PSU) and mental health problems. The purpose of this meta-analysis was to evaluate the relationship between PSU and symptoms of anxiety and/or depression. METHODS: We searched for research literature published recently in PubMed and Google Scholar via a systematic literature search. Twenty-seven studies published since 2014 with 120 895 participants were included in the meta-analysis. RESULTS: PSU was moderately but robustly associated with both anxiety, r = 0.29 (95% CI: 0.23-0.35), and depression, r = 0.28 (95% CI: 0.22-0.34), P < 0.001 for both. Homogeneity tests showed significant P-values for anxiety and depression, but without affecting the results. Neither the age of the participants, publication year nor the study quality could explain the heterogeneity. Furthermore, we found no evidence for publication bias, since Egger's regression test showed no significance for depression (P = 0.21) and anxiety (P = 0.35). CONCLUSIONS: Our study shows that PSU can be viewed as an indicator of symptoms of anxiety and depression and a possible manifestation of these mental health problems in modern society. Furthermore, PSU as a maladaptive coping behavior may contribute by worsening these symptoms. PSU screening should thus become part of standard clinical psychological diagnostic procedures.

Psychological online interventions for problem gambling and gambling disorder - A meta-analytic approach.

OBJECTIVE: The Covid-19 pandemic has reignited discussions about the prevalence of and treatment options for problem gambling and gambling disorder (PGGD). Since affected persons seldom seek professional help, online interventions can improve accessibility. Thus, this study aimed to investigate the effectiveness of psychological online interventions on PGGD. METHODS: We conducted a systematic review and meta-analysis and searched in PubMed, PsycINFO, and Google Scholar for peer-reviewed experimental and quasi-experimental research published between 2010 and 2021. We calculated two meta-anlyses, one for treatment control comparisons (TCC), and one for pre-post-comparisons (PCC). RESULTS: We included six studies (ten TCC and n = 2076) in meta-analysis 1 and five studies (six PCC and n = 781) in meta-analysis 2. Online interventions turned out to be effective in both analyses with Hedges g = 0.41, 95% confidence interval = [0.22 to 0.60], p < .001, for meta-anaylsis 1 and Hegdes g = 1.28, 95% confidence interval = [0.85 to 1.71], p < .001, for meta-analysis 2. CONCLUSIONS: We identified significant effects of online interventions on PGGD in both analyses, indicating the potential of online applications. We discuss methodological aspects and further research directions.

Neurocognitive impairment in night and shift workers: a meta-analysis of observational studies.

OBJECTIVE: Shift work is an essential element of modern labour, ensuring ideal conditions of service for today's economy and society. Despite the beneficial properties, its impact on the neurobehavioural performance of exposed subjects remains controversial. This meta-analysis aimed to provide the first summarising effects regarding the association between shift work exposure and different cognitive functions. METHODS: A literature search was performed using the databases PubMed, PsyINFO, PsyARTICLES, MedLine, PsycNET and Scopus including eligible studies up to April 2021 that compared shift workers with non-shift workers regarding neurobehavioural performance tests. We carried out a random-effects model using Hedges' g as a meta-analytical effect size with a restricted likelihood estimator to summarise the mean differences between the exposure group and controls. Positive effect sizes indicate higher performance for non-shift workers. The heterogeneity of effect sizes was addressed by sensitivity analysis using funnel plots, Egger's tests, p-curve analysis, meta-regressions and subgroup analysis. RESULTS: We included 18 studies resulting in a total sample of 18 802 participants and 37 effect sizes concerning six different neurobehavioural outcomes. Our results showed significantly worse performance in shift workers compared with non-shift workers in the following cognitive functions with g (95% CI): processing speed 0.16 (0.02 to 0.30), working memory 0.28 (0.51 to 0.50), psychomotor vigilance 0.21 (0.05 to 0.37), cognitive control 0.86 (0.45 to 1.27) and visual attention 0.19 (0.11 to 0.26). CONCLUSIONS: We provide the first meta-analytical findings that associate shift work with decreased cognitive performance in processing speed, working memory, psychomotor vigilance, cognitive control and visual attention.

Tackling the 'digital pandemic': The effectiveness of psychological intervention strategies in problematic Internet and smartphone use-A meta-analysis.

OBJECTIVE: Problematic Internet and smartphone use is associated with serious mental health problems. We thus investigated the effectiveness of psychological interventions on problematic Internet and smartphone use. METHODS: We conducted a systematic review and meta-analysis and searched in PubMed, PsyArticles, PsycInfo, Medline and Google Scholar for peer-reviewed experimental and quasi-experimental research published between 2008 and 2021. RESULTS: A total of 10 studies accompanied by 14 effect sizes were included in the meta-analyses for problematic Internet use and 3 studies accompanied by 4 effect sizes for problematic smartphone use. The total sample size was n = 1439 with a mean age of 20.34 (SD = 6.63) years. Psychological interventions were effective for both problematic Internet use (g = -1.41, 95% confidence interval = [-1.90, -0.91], p < 0.001) and problematic smartphone use (g = -0.40, 95% confidence interval = [-0.79, -0.01], p < 0.001). CONCLUSION: Current evidence indicates that psychological interventions can be effective in reducing problematic Internet use/problematic smartphone use. However, the results must be considered preliminary due to the limited number of studies available in the respective fields.

Assessing Psychological Fitness to Drive for Intoxicated Drivers: Relationships of Cognitive Abilities, Fluid Intelligence, and Personality Traits.

Our study explores the relationships between traffic-psychological driving-related personality traits, fluid intelligence, and cognitive abilities for drivers whose driver license has been revoked due to intoxicated driving (alcohol and/or drugs). We were able to show that high significant impacts on cognitive functions derive from the participants' age and fluid intelligence. In addition, driving-related personality traits like emotional instability, sense of responsibility and self-control contributed significantly to some of the cognitive abilities that are important for the fitness to drive. Additionally, mediating effects of fluid intelligence in the model are discussed. Traffic psychologists can use this knowledge in their assessment of drivers, mainly regarding the possible compensation of cognitive deficits regarding the fitness to drive.

Long-term effects of parental divorce on mental health - A meta-analysis.

The aim of this study was to estimate the long-term effects of parental divorce on their offspring's mental health as well as substance-based addiction. We performed a systematic literature search on PubMed, Medline, PsyINFO, PsyARTICLES and PsycNET for the time period from 1990 until March 2018 in English language. In total 54 studies were included in the meta-analysis resulting in 117 effect sizes as well as a total sample of 506,299 participants. A significant association between parental divorce and every aspect of mental health was found with the following pooled ORs (95% CIs): Depression 1.29 (1.23-1.35), anxiety 1.12 (1.04-1.12), suicide attempt 1.35 (1.26-1.44), suicidal ideation 1.48 (1.43-1.54), distress 1.48 (1.37-1.6), alcohol 1.43 (1.34-1.53), smoking 1.64 (1.57-1.72) and drugs 1.45 (1.44-1.46) could be estimated. There was significant association between the effect sizes and the publication date specifically for distress (r = -0.995, p = .005). The results of the meta-analysis show a consistent direction of influence regarding the long-term effect of parental divorce on their children. Individuals affected by parental divorce have a higher risk of developing a variety of mental health conditions, although the effect sizes decreased from 1990 to 2017. Further research should focus on developing programmes to promote the resilience of children affected by divorce.

Blood lead levels and cognitive functioning: A meta-analysis.

OBJECTIVE: The neurotoxicity of lead is well-known and even low exposure levels potentially impact neurocognitive abilities. This metaanalysis aimed to investigate associations between neurocognitive performance and lead exposure in adults and further assess potential effect thresholds. MATERIAL AND METHODS: Articles indexed in Medline published until January 2017 reporting associations between lead exposure, blood lead, cognitive abilities and sensomotoric performance were included. The unbiased, standardized mean differences g between lead exposure and control groups extracted from the primary studies were pooled using a three-level, random-effects meta-analytic model with a restricted maximum likelihood estimator. Moderator analyses were conducted using weighted, mixedeffects regression analyses. RESULTS: We identified 22 articles (n=3,849 participants, mean age 39.94±7.87years) published between 1976 and 2014 reporting lead exposure effects on cognitive and sensomotoric parameters (verbal abilities, visuospatial abilities, memory, attention, psychomotor function). On average, blood lead concentrations were 21.09±6.44 µg/dl higher in exposed than in control subjects. After exclusion of outliers, the random-effects three-level meta-analysis identified a significant (p<.001) pooled mean difference between exposure and control groups. Except for a smaller effect in the digit symbol test (p<.05), lead exposure did not result in different outcomes across the examined cognitive measures. Based on a marginally significant (p=.06) effect of difference in exposure levels, a blood lead increase of 10 µg/dl translated into a decline in cognitive abilities of Hedges g=.09. CONCLUSIONS: Neurocognitive performance in adults with occupational or environmental lead exposure was significant impaired with regard to the examined parameters. However, further studies are needed for the determination of effect thresholds and reversibility.