Interest is a key motivational variable that refers to a person's predisposition to engage in particular objects (topics, activities, and ideas) [1, 2]. The development of interest can be divided into four phases: triggered situational interest, maintained situational interest, emerging individual interest and well-developed individual interest [1, 2]. When interest is triggered, individuals are more willing to process the information they find interesting and to learn more deeply through detailed descriptions that relate the new information to existing schemas [1, 2], while interest is well developed, individuals demonstrate positive affect, the ability to allocate attention, persistence in learning, and greater knowledge of the topic [2, 3]. Consequently, interest plays a crucial role in improving students' learning state and quality [4], and it has always been a great concern of educators. According to a multiple prediction design study involving 518 students, learning interest is a powerful predictor of future academic achievement [5], which is similar to Rösler's findings [6]. In addition, learning interest has been found to positively correlate with learning satisfaction [7], self-efficacy [8] and critical thinking [9].
Considering interest's galvanizing effects on students’ learning, many researchers have devoted themselves to exploring methods and factors influencing students' interest in learning [10]. To improve students' interest in learning, it is essential to understand their level of interest [10]. An appropriate measure of interest can provide teachers with critical information about topics, courses, and tasks, so that they may adjust their teaching strategies accordingly to ensure best outcomes. Nevertheless, the problem is that the measurement of learning interest in China is still in the initial stage of exploration. Current measurements are mostly one-dimensional, lack a fundamental theory on which to develop, and do not provide valid and reliable information [11]. Even among the measurements with reliability and validity verification, most of them focus on measuring primary and middle school students' interest in certain subjects (such as mathematics, English, chemistry, etc.) [12, 13]. Ge [12] revised the Physical Education Situational Interest Scale (PESIS) and tested its reliability and validity in 2005. The adjusted PESIS proved to be both reliable and valid and could effectively measure the situational interests of high school students in sports. In 2019, Luo et al. [13] developed and validated the Academic Interest Scale for Adolescents (AISA) in the Chinese education context. The study concluded that the Chinese version of the AISA was effective for measuring academic interest in Chinese adolescents across different subjects (e.g., math, English, or Chinese), times, genders, and grades. However, there is currently no measurement for assessing health care students' interest in professional learning in China [11].
The Study Interest Questionnaire (SIQ) was originally designed by Winteler & Sierwald [14] and has been revised twice [15]. The most recent version of the SIQ was developed to evaluate specific components of interest based on educational interest theory [16]. A total of 18 items are included in the recent version and primarily address students' enjoyment and value of subjects and activities [16, 17]. Each of the items is rated on a Likert scale between 1 (not at all true) and 4 (completely true) [17]. Items 1, 2, 5, 7, 9, 10, and 11 are reverse coded, and a higher total score indicates a higher level of interest in the student's field of study [17]. Since the Cronbach's alpha coefficient of the questionnaire was 0.90 and factor loadings ranged from 0.36 to 0.68 on the factors 'interest' and 'cognitive competence', the reliability and validity of this SIQ were deemed satisfactory in German college students [16, 17]. In 2006, Bråten et al. translated the SIQ into Norwegian and tested the psychometric properties [18]. The Norwegian version of the SIQ has been proven to be a reliable scale (Cronbach's alpha coefficient = 0.82) and has been widely used to measure the learning interests of Norwegians [18]. The SIQ was also translated into a Croatian version, and the Cronbach's alpha reliability coefficient for it was 0.91 [19]. In addition, some researchers created their own scales based on the items of SIQ [20, 21]. According to the SIQ, Pravestİ [21] developed their scale to examine the direct and indirect effects of interest, motivation, and behavior on self-regulated learning in Indonesia. Hidalgo-Blanco [20] relied on the SIQ to create their own items to assess the dimension of interest in nursing studies, and the results revealed that their scale was of acceptable reliability and validity in Spain. Considering the satisfactory reliability and validity of the SIQ and the fact that it has a very broad application globally [22, 23], the current study aims to translate the SIQ and examine its psychometric properties among Chinese health care students.