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The aim of this study is to examine the structural relationship in the transtheoretical model (TTM) of behavioural change constructs among undergraduate students. A cross-sectional study was carried out by randomly selecting students participating in campus co-curricular activities. Questionnaires, comprising queries on the stages of change (SOC) — an 18-item self-efficacy (SE) scale, a 10-item decisional balance (DB) scale, and 30-item processes of change (PoC) scale — were distributed to the students. Their answers were analysed using Mplus 8 software for structural equation modelling. There were 562 participants comprising 118 males (21.0 %) and 444 females (79.0 %) with average age of 19.81±1.22 SD. Most of them were involved in sports (46.3 %) and non-sports (46.6 %) programmes, and exercised at least three times per week for approximately 43 minutes per session. Minority of the undergraduate students (7.1%) are involved in uniform group. The initial hypothesized structural equation modelling showed that the data fitted well. The fit indices were within recommended values (CFI= 0.967; TLI= 0.939; SRMR= 0.034; RMSEA (CI: 90%) = 0.049 (0.028, 0.070); RMSEA p= 0.495). There were three hypothesized path relationships in this model. From the final structural model, the SOC had significant direct effects on SE (p = 0.001), DB (p < 0.001) and PoC (p < 0.001). In conclusion, the study showed a positive relationship between TTM constructs. It could act as an excellent baseline model for physical activity intervention or motivational intervention.
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