The development of safety culture assessment and its validation: case study of Thai truck drivers
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2018
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2561
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eng
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application/pdf
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236 leaves
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b207557
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ผลงานนี้เผยแพร่ภายใต้ สัญญาอนุญาตครีเอทีฟคอมมอนส์แบบ แสดงที่มา-ไม่ใช้เพื่อการค้า-ไม่ดัดแปลง 4.0 (CC BY-NC-ND 4.0)
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National Institute of Development Administration. Library and Information Center
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Supavanee Thimthong (2018). The development of safety culture assessment and its validation: case study of Thai truck drivers. Retrieved from: https://repository.nida.ac.th/handle/662723737/6454.
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The development of safety culture assessment and its validation: case study of Thai truck drivers
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Abstract
Safety culture assessment is the instrument that can be used to capture
employees’ perception about organizational safety culture in various dimensions. The
main objective of this research was to investigate the constructs of multidimensional
safety culture and consequently to develop a reliable and valid instrument to measure
Thai truck driver’s perception on safety culture level in the workplace.
This study employed the exploratory sequential mixed-method design ( i. e.
qualitative research followed by quantitative research) to achieve the research
objectives. The qualitative research was conducted using the indept interview with 12
subject matter experts ( e. g. 6 truck drivers, 3 logistics personnel, 2 safe-driving
trainers, and 1 top management) in logistics industry using purposive sampling in
order to determine the key constructs of safety culture in the context of Thai truck
drivers. In accordance with the interview results, the existing accident causation
model was applied to structure the key dimensions of safety culture. As a consequent,
the key constructs were identified. Pool of items was generated adapting from existing
instruments as well as newly developed based on the interview results. The first draft
of safety culture assessment questionnaire was developed with 60 items altogether.
Next step, the quantitative study was performed in order to examine reliability
and validity of the newly developed scale. Firstly, the pilot test was conducted with 75
samples for item analysis purpose. At this stage of analysis, total of 19 items were
removed. As a result, 41 items were remained for next analysis. The 41-item questionnaires were distributed to 1,010 truck drivers with 413
questionnaires returned, accounted for 40. 89% . These questionniares were then
proceeded in the next level of analysis. Exploratory factor analysis ( EFA) was
performed to identify sub-factors of each dimension. Eight sub-factors with total of 30
items were emerged as a result of EFA including management commitment, safety
rules and training, supervisor support, co-worker support, work conditions, personal
conditions, attentive action to safety, and supportive action to safety. Consequently,
Confirmatory factor analysis (CFA) was performed to validate all the measurement
constructs. The results suggested that the four-dimension safety culture model ( 30
items) had an acceptable fit with the data (RMSEA = 0.044, RMR = 0.020, CFI =
0. 997, GFI = 0. 989 and composite reliability = 0. 8987) . Therefore, the result
supported the good reliability and convergent validity (CR = 0.90 and AVE = 0.53) of
newly developed safety culture assessment.
In order to examine the concurrent validity, two analyses were performed.
First, partial correlation was used to examine the relationship between four safety
dimensions and safety outcomes. The result revealed that employee safety behavior
dimension had negative relationship with the likelihood of near-miss accident. In
addition, the structural equation modeling (SEM) was later conducted to examine how
safety culture influence safety outcomes. After adjusting the model, the results
suggested that safety culture had a direct effect on both safety outcomes, as well as
produced an indirect effect to the likelihood of accident transmitted through the
likelihood of near-miss accident. As a consequent, the results showed evidence for
good concurrent validity of the studied instrument. The paper also discussed the
limitation of the study, the possible future research as well as implications for
utilizing safety culture assessment.
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Thesis (Ph.D. (Human Resource and Organization Development))--National Institute of Development Administration, 2018