Three multiplicative models commonly used in the analysis of occupational cohort studies are logistic, Poisson, and Cox proportional hazards regression. Although the underlying theories behind these are well known, this has not always led to clear decisions for selecting which to use in practice. This research was conducted to examine the effect model choice has on the epidemiologic interpretation of occupational cohort data. The three models were applied to a National Cancer Institute historical cohort of formaldehyde-exposed workers. Samples were taken from this dataset to create scenarios for model comparisons, varying the study size (n = 600, 3000, 6000), proportion of subjects experiencing the outcome (2.5%, 10%, 50%), strength of association between exposure and outcome (weak, moderate, strong), follow-up length (5, 15, 30 years), and proportion of subjects lost to follow-up (0%, 10%, 17.5%). Other factors investigated included how to handle subjects lost to follow-up in logistic regression. Models were compared on risk estimates, confidence intervals, and practical issues such as ease of use. The Poisson and Cox models yielded nearly identical relative risks and confidence intervals in all situations except when confounding by age could not be closely controlled in the Poisson analysis, which occurred when the sample size was small or outcome was rare. Logistic regression findings were more variable, with risk estimates differing most from the Cox results when there was a common outcome or strong relative risk. Logistic was also less precise than the others. Thus, although logistic was the easiest model to implement, it should only be used in occupational cohort studies when the outcome is rare (5% or less), and the relative risk is less than about 2. Even then, since it does not account for follow-up time differences between subjects or changes in risk factors values over time, the Cox or Poisson models are better choices. Selecting between these can usually be based on convenience, except when confounding cannot be closely controlled in the Poisson model but can in the Cox model, or when the Poisson assumption of exponential baseline survival is not met. In these cases Cox should be used.

Syftet med denna studie var att undersöka hur medarbetarna upplever att den informella ledaren påverkar säkerhetskultur- och arbete. En kvantitativ metod användes där skillnaden mellan grupperna (de som enbart har en närmsta chef och de som angett att de har både en närmsta chef och en informell ledare) analyserades med ett oberoende t-test. För att mäta samband användes informell och formell ledare som prediktorer och säkerhetskulturen som utfallsvariabel i en multipel regression. Därefter analyserades även flervalsfrågor gällande arbetsuppgifter- och områden i form av deskriptiv statistik. I organisationer som upplever att det finns en formell och informell ledare tycks båda fylla en roll för säkerhetskulturen, men den närmsta chefen upplevs vara av större vikt än den informella ledaren. Inga signifikanta skillnader observerades mellan grupperna. Slutsatsen var att både den formella och informella ledaren spelar en roll inom säkerhetskultur- och arbete, men att den formella ledarens roll är av större vikt. / The purpose of this study was to research how staff members of an organisation perceive how the informal leader affects the safety culture and safety work. A quantitative method was used where the difference between groups (one group with formal leaders and one group with formal and informal leaders) was analysed with an independent t-test. To measure correlation the informal and formal leaders were used as predictors and safety culture was used as the criterion variable. Multiple choice questions were analysed thereafter in descriptive statistics regarding the work assignments. In organisations where both an informal and formal leaders were perceived, it showed that they both have an effect on safety culture. No significant differences were observed between the groups. The conclusion was that both forms of leaders play a part in safety culture and work, but the formal leader has a bigger part than the informal leader.

Thesis (MPH.) -- University of Limpopo, 2016 / The purpose of this study was to assess the knowledge and practices of food service staff regarding food safety and food hygiene in Capricorn District hospitals, Limpopo Province. Quantitative, cross-sectional research was conducted to determine the knowledge and practices of food service staff. A convenient sampling technique was employed to select 84 food service staff members (11 food service supervisor and 73 food service aids). Data collection was done using structured questionnaires. Food service staff members consisting of food service aids and food service supervisors participated in the study. The data were analysed using the statistical package for social sciences version 23. Of the respondents 50 (60%) are female whereas 34 (40%) are males. The largest group of them, 34 (40%) had secondary education, 23 (27%) had matric whereas 16 (19%) had post matric qualifications. 80 (95%) of them answered correctly that they use an air dryer or paper towel for drying hands after washing whereas 65 (77%) answered incorrectly when asked the difference between washing and sanitizing. Seventy eight of the respondents answered correctly on practice questionnaire that they only reheat leftovers once whereas 69 (82%) answered incorrectly about the temperature one should maintain for potentially hazardous food that has been cooked and needs to be reheated. In this study a significant correlation was observed between level of education and knowledge, with p-value 0.016 and again between level of education and practices (p-value 0.024), also between work activity and practice (p-value 0.021). There was significant difference between knowledge level and practice with p-value 0.045. The result of the study suggest that although most food service staff are knowledgeable regarding some aspects of food hygiene and food safety significant gaps remains in food safety practices, posing risk to hospitalised patients who are already vulnerable. There is a need for training in areas were food service staff are lacking knowledge.

This master’s thesis deals with the security machinery using available technologies. It contains a description to assess and reduce the risk of machine design of security measures and their application. In each section are provides descriptions of the standards, using the CIP Safety communication technology, design and implementation security measures of machine at two demonstration learning tasks.

This dissertation attempts to bring clarity and certainty in respect of the regulation of the health and safety aspect within the Namibian mining Industry. At the moment, there is lack of legal clarity in Namibia as to which set of laws or regulations applies to the mining industry in so far as health and safety of employees within the extractive industry is concerned therefore making it difficult for the industry to comply or comprehend its legal obligations. The absence of legal clarity culminated into uncertainty over which state functionaries are entrusted with the responsibility to regulate the health and safety aspect of mining in Namibia. It is observed that the uncertainty which prevails in the Namibian mining industry as to which laws or regulations are applicable in respect of health and safety of employees at work is attributed to and aggravated by the misconception of the Ministry of Mines and Energy which fails comprehend its role due to lack of proper legal advice and thereby assuming status quo. This research has found that Ordinance 20 of 1968 and its regulations were repealed to the extent that it dealt with health and safety of employees on mines and consequently the regulations of 1968 do not find application in Namibia since 1 November 1992. This paper further reveals or identifies the Health and Safety Regulations on the Health and Safety of Employees at Work made under Labour Act 6 of 1992 as the applicable law in this regard notwithstanding the fact that the assignment of the administration of functions under the Health and Safety regulations, is vague and contributes to the uncertainty instead of ameliorating the situation. The ordinance continues to be implemented by the ministry as if it is still applicable and very little is actually implemented under the 2007 Labour Act. Therefore, one can clearly say that in the absence of a new regulatory regime which introduces substantial change, there is nothing to measure against unless the Labour Act Regulations are properly assigned with post assignment directives. / Mini Dissertation (LLM)--University of Pretoria, 2017. / Public Law / LLM / Unrestricted

MPH / Department of Public Health / Occupational Health and Safety has become one of the leading concerns throughout the cleaning industry. Compliance with safety regulations among cleaners of the University of Venda is still a challenge. The study aims to investigate factors contributing to non-compliance with safety regulations among cleaners: A selected rural university in South Africa. The study was conducted at the University of Venda, South Africa. A quantitative approach using cross-sectional descriptive survey design was employed. A pre-test was carried out to determine the reliability of the researcher-developed questionnaire. A total population will be applied and all the 164 was included in the study. The data collected was analyzed using SPSS 23.0. Data was presented in the form of graphs, tables and charts. A self-administrated questionnaire was used to collect data. Results: A total population of 164 cleaners took part in the research project, 119 (74%) were females and 45 (26%) were males. Among the participant 5%, n = 9 had no form of education background, 28%, n = 46 with a primary education background, 48%, n = 79 with a secondary education back and only 19%, n = 30 with a post-secondary background. Participants with a post- Matric back ground showed significant understanding (90%, n = 27) on the importance of complying with safety guidelines, as compared to those with no form of formal education (44%, n = 4). There was a significant relationship between gender and level of education with regards to the factors contributing to non-compliance with safety regulations among cleaners. The study revealed that the female participants are more likely to adhere to safety regulations (65%, n = 74) as compared to male participants (63%, n = 26). Majority of cleaners have a fair knowledge on the safety compliance within the working environment, however there is a need to put more effort on the safety regulations practice. Conclusion: The study concludes that female participants are more cautious within the workplace as compared to the male participants and that the level of education also has significant relationship on the level of compliance with regards to safety regulations. Recommendations: There is a need to have a functional safety committee that will ensure that all safety protocols are being followed, the committee may also amend the existing policy on given period of time. / NRF

In Analogie zu den Systemen für die KKW Saporoshje und Rovno wurden für die drei Blöcke des KKW Südukraine und für den ersten Block des KKW Chmelnitzky technische Systeme zur verbesserten betrieblichen Überwachung eingerichtet. Dazu werden der Aufsichtsbehörde vor Ort und im Krisenzentrum in Kiew einmal pro Minute für jeden Block bis zu 51 sicherheitsrelevante technologische und 16 radiologische Parameter zur Bewertung mittels moderner technischer Ausrüstungen online zur Verfügung gestellt. Die entwickelte Auswertesoftware gestattet die Darstellung der Bewertungsergebnisse in Form von Tabellen, Grafiken und Schemata. Außerdem ermöglicht ein Archivmodus Trendanalysen. Mit der Integration der für die geschützte Warte gelieferten Ausrüstungen in das am Standort des KKW Saporoshje betriebene Fernüberwachungssystem ist es nunmehr möglich, die wesentlichen sicherheitsrelevanten Parameter des gesamten Standortes auch bei außergewöhnlichen Ereignissen mit Hilfe moderner Technik zu erfassen und zu bewerten.

There is a debate among researchers and clinicians as to whether the judicious use of safety behaviours (SBs) during exposure therapy is helpful or detrimental. Central to this debate is the premise that SBs may interfere with one’s ability to gather disconfirmatory evidence. However, no study to date has assessed: 1) how SB use may interact with cognitive mechanisms at play during an exposure-like task, or 2) whether it is SBs themselves, or rather, beliefs about SBs that are most important. The two studies outlined in this dissertation sought to investigate the cognitive, emotional, behavioural, and psychophysiological underpinnings and consequences of exposure with SBs. In Study 1, speech anxious participants (N = 111) were randomly assigned to deliver an evaluated speech with or without SBs. Self-reported anxiety ratings and psychophysiological arousal measures were recorded at baseline, in anticipation of the speech, and following the speech. Measures of working memory capacity, ability to gather disconfirmatory evidence, and speech task acceptability were administered. Results demonstrated no differences between conditions on most outcomes. However, condition did influence willingness to deliver future speeches, such that participants in the SB condition were less willing than those in the NoSB condition to deliver a future speech without SBs. In Study 2, speech anxious participants (N = 144) were given divergent information on the helpfulness of SBs. Participants were randomly assigned to one of three conditions and were told either that SBs are: helpful (decrease anxiety), unhelpful (counterproductive and increase anxiety), or were provided with no information on the anxiolytic effects of SBs (control condition). Self-reported anxiety ratings were recorded at baseline, in anticipation of the speech, and following the speech. Similar to Study 1, measures of working memory capacity, ability to gather disconfirmatory evidence, and speech task acceptability were administered. Results demonstrated that participants in the helpful condition perceived the exposure as being more likely to succeed in helping them reduce their anxiety. Moreover, exposure expectancy mediated the relationship between the helpful condition (but not the unhelpful condition) and willingness to engage in future exposure exercises. There were no differences between conditions on most other outcomes. Taken together, these findings suggest that SB use may not necessarily be detrimental to outcomes on an exposure-like task, as individuals were able to gather disconfirmatory evidence (one of the proposed primary mechanisms underlying exposure success) across conditions in both studies. However, clients may believe SBs to be more helpful than they actually are, and clinicians should work collaboratively with clients to identify whether judicious SB use may be appropriate and helpful (or inappropriate and detrimental) in achieving their treatment goals. The current research program has the potential to improve our understanding of the consequences of SB use and identify the ways in which cognitive behavioural therapies could be improved.

This study was conducted to determine whether adding in-vehicle technology to vehicles resulted in increased driver awareness of motorcycles. The specific technology tested consisted of a warning light which illuminated on the vehicle’s instrument panel when the vehicle was near a motorcycle. The effect of motorcycle color on driver awareness was also explored. Participants were recruited to drive a highidelity driving simulator in a city environment. Eye-tracker data was collected and used to determine how much attention drivers paid to the motorcycles in the simulation. Results showed that the in-vehicle technology significantly increased driver awareness of motorcycles, but the color of the motorcycles had no impact on driver awareness.

No description available.