Abstract
Objective: The aim of this study is to investigate the validity and reliability of the Short Multidimensional Lifestyle Assessment-Isolation (SMILE-C) Questionnaire, which was developed to evaluate lifestyle multidimensionally during the COVID-19 pandemic, in the Turkish sample.
 Method: The research was carried out 345 university students who were able to actively access the internet between April 2021 and February 2022. Participants filled in the inquiry forms sent to them online. Lifestyle changes during the closure period within 1 year from the first date of the virus in Turkey were evaluated with SMILE-C. The construct validity was evaluated with Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis, internal consistency with Cronbach's α coefficient, and test-retest reliability with intraclass correlation coefficient. The Healthy Lifestyle Behaviors Scale II (HPLP-II) and the International Physical Activity Questionnaire-Short Form (IPAQ-SF) were used to assess criterion validity.
 Results: Cronbach’s α was 0.74 and ICC2.1 was 0.86. The EFA showed a six-factor model and four items loaded on more than one factor. The fit index values confirmed a good fit (Root mean square error of approximation=0.052; Goodness of fit index=0.940; Adjusted goodness of fit index=0.914; Comparative fit index=0.924; Normed fit index=0.901). Statistically significant and positive correlations were found between SMILE-C total score and HPLP-II total score and all sub-dimensions (p
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