Validation of a Spanish Adaption of a Questionnaire for Measuring Nomophobia among University Students

Nomophobia is a pathological fear of losing connectedness being to people. The objectives of this study were to evaluate the four dimensions of the original version of the NMP-Q questionnaire by Yildirim and Correia using the Spanish version of the questionnaire developed by Gutiérrez-Puertas et Similarly, this research aims at assessing whether the questionnaire retains its four-dimensional structure when applied to a population of university students in the area of social sciences at a Mexican university. Using con ﬁ rmatory and exploratory factor analysis techniques, we determined that nomophobia among the study population can be addressed through the ﬁ rst three dimensions of the original questionnaire, namely, not being able to communicate, losing connectedness, and not being able to access information. A fourth dimension, entitled “ giving up convenience ” is mentioned in the literature. However, in this study, this dimension could not be clearly identi ﬁ ed with the indicators included in the original questionnaire and was, therefore, omitted from the resulting questionnaire. Nomophobia is a modern phenomenon that is becoming increasingly prevalent in our society. Therefore, it must be studied and addressed. The nomophobia questionnaire presented in this article is a reliable way of taking measurements, as indicated by the research results. Further research should deepen the study of measuring nomophobia and improve the questionnaire through other indicators and conceptual dimensions that help explain this phenomenon in a precise and reliable way.


Introduction
Technology has brought numerous benefits that have changed our daily lives. Indeed, the usefulness of smartphones in modern daily life is undeniable. These phones have become versatile devices with which we can access banking applications, social networks, instant messaging, email, games, and the web, among many other possibilities, in addition to making traditional voice calls. Smartphones have significant utility in the lives of human beings. However, their use can lead to problems, such as dependency and addiction [1]. These problems derived from the use of smartphones have increased in recent years and have been identified as dangerous because they can lead to antisocial behavior. In fact, smartphone addiction has been regarded as any other addiction to dangerous substances and even as a public health problem [2]. However, Smartphone addiction is not currently accepted in the DSM-V. This field is still emerging, and researchers and practitioners have yet to meet a consensus.
Nomophobia is the fear of losing mobile connectedness [3], the fear of being without a cell phone [1], the fear of being without one's phone [4], or even the modern fear of not being able to access information and/or communicate with other people [5]. Nomophobia is, then, a pathological fear [6]. Some symptoms often associated with nomophobia include excessive smartphone use, anxiety about losing cell coverage, continually checking messages or missed calls, and the feeling that the phone is ringing or vibrating [7]. According to Jahagirdar et al. [8], nomophobia and other disorders have emerged "from the excessive use of mobiles". As such, nomophobia is a modern phenomenon on the rise [9] and an emerging area of research [10]. This term derives from the phrase "No-mobile-phone phobia" and was coined in 2008 by an English organisation evaluating cell phone user anxiety [11].
In recent years, nomophobia has been measured using the NMP-Q questionnaire originally designed in English by [3]. This instrument contains 20 questions distributed in four dimensions, namely, not being able to communicate, losing connectedness, inability to access the connection, and giving up convenience (see Table 1). This instrument has been translated into various languages such as Arabic [12], Farsi [9,13], Portuguese [14], Italian [7], Chinese [15,16], and European Spanish [6,17], and [18]. Some translations of the original NMP-Q instrument have proved valid when using or adapting three of the originally defined dimensions (see Table 2).
The objectives of this study were to evaluate the four dimensions of the original version of the questionnaire by [3] using the Spanish version of the questionnaire developed by [17] to assess whether the questionnaire retains its fourdimensional structure when applied to a population of social sciences students at a Mexican university.
The following section addresses the method. Then, the results and their discussion are shown. Lastly, conclusions and future perspectives are presented.

Materials and Methods
2.1. Participants. In total, 176 university students from two academic programs (Bachelor of Information Technology and Bachelor of Administration) participated in this study. All participants belonged to the Department of Social Sciences of a public state university in Mexico and were officially enrolled in the 2022 January-May semester. Participant characteristics are outlined in Table 3. A convenience sample method was used for this study.

2.2.
Questionnaire. The instrument used in this study is the questionnaire translated by [17], which was provided by them at the request of the authors of this article. This questionnaire is a Spanish version of the original NMP-Q questionnaire developed by [3] in English (see Table 4).
To conduct this research, an online version of the questionnaire was implemented using Microsoft Forms. The respective hyperlink was sent to students through the Microsoft Teams institutional platform. Four teachers sent the invitations to the students of the two academic programs. Participation in the study was voluntary and without any compensation or incentive. The students who answered the questionnaire gave their informed consent to contribute their answers. They were guaranteed anonymity, confidentiality, and respect in the treatment of their responses.

Data Analysis
Techniques. Data were analyzed using JAMOVI 2.2.5.0 software. First, we explored the participants' responses. There were no missing or invalid values as the electronic questionnaire was configured to force the Not being able to receive text messages and calls. Losing connectedness "Feelings of losing the ubiquitous connectivity smartphones provide and being disconnected from one's online identity" Not being able to stay up-to-date with social media. Not being able to access information "Discomfort of losing pervasive access to information through smartphones" Not being able to look information up on the smartphone when desired. Giving up convenience "Feelings of giving up the convenience smartphones provide" Running out of battery on the smartphone.   . When reviewing them, we found that the model could be improved. For this reason, we continued investigating the factorial structure of the responses, albeit now without a predetermined fixed scheme, that is, introducing the 20 questions of the original questionnaire in an exploratory factor analysis (EFA) using, for this purpose, the minimum residual and the Oblimin rotation methods. The criterion based on parallel analysis was used to determine the number of factors. Bartlett's sphericity tests and the Kaiser-Meyer-Olkin (KMO) test for sam-pling adequacy were also performed twice, eliminating two questions that presented problems related to a low factorial load in the first instance and eliminating three questions whose factorial loads placed them in a factor that did not correspond to the original structure of the questionnaire in English in the second instance. Then, the indicators of the models were compared, and the indicator with the best fit was chosen. The resulting model retained the first three factors of the original questionnaire in English without changes and did not include the fourth factor. With this three-factor model, the values of Cronbach's alpha and McDonald's omega scores were calculated. Lastly, a confirmatory analysis was performed to verify the proposed structure of the threefactor model.

Reference Values Used in This Study
. RMSEA values lower than 0.05 were considered a good fit; values ranging from 0.05 to 0.08, an acceptable fit; values ranging from 0.08 to 0.10, a marginal fit; values higher than 0.10, a poor 3 Human Behavior and Emerging Technologies fit [19]. SRMR values were also considered appropriate when lower than 0.05 [20] and acceptable when lower than 0.08 [16]. CFI and TLI values were considered acceptable when higher than 0.90 [16] and good when higher than 0.95 [21]. The AIC and BIC values were used to compare the models. The model with the lowest AIC value is preferred because this model has the best fit [22]. BIC values are interpreted in this same way [23]. For Cronbach's alpha, higher values express higher reliability. Values between 0.70 and 0.90 are considered 'satisfactory to good' [23].

Explanation of the Data Analysis Techniques and
Reference Values. According to [24], confirmatory factor analysis (CFA) is used when expecting a factorial structure of a data set and previous evidence supports this structure. Thus, CFA is applied to determine how well a latent variable model fits observed data. In contrast, exploratory factor analysis (EFA) answers the question of how many factors underlie a set of observable indicators and what structure the relationship between factors and indicators adopts. [25] explain that, in EFA, the Bartlett's sphericity test evaluates the assumption of a correlation between the variables to assess whether the technique should be used. With the same objective, the Kaiser Meyer Olkin (KMO) Index evaluates the strength of the relationship between items based on partial correlations.
According to [21], the indices used to evaluate the goodness-of-fit of the models can be classified into absolute and incremental. Absolute indices, such as SRMR and RMSEA, assess how well a predefined model reproduces the data from a sample. Incremental indices, such as CFI and TLI, improve the fit when comparing the target model with a more restrictive base model. Accordingly, in the comparison model, the observed variables are not correlated.
In turn, [26] explains that discrepancy indices, such as AIC and BIC are used to select the simplest model that accurately describes the observed data. [27] add that both indices determine the statistical adequacy. [22] state that AIC is used to test the difference between the models. Thus, AIC indicates whether the models differ significantly and identifies the model with the best fit.    Table 5 outlines the statistical parameters of the participants' responses ðn = 176Þ.
CFI and TLI were lower than 0.90; SRMR was higher than 0.05, and RMSEA was very close to 0.10, thus indicating that a better fit model could be derived. For this reason, we continued our research in this regard. Then, an exploratory factor analysis (EFA) was performed to find the optimal structure for the data collected, giving rise to Model 1 (M1, see Table 3). Three factors were identified, which corresponded to the first three factors of the original questionnaire in English. However, there were problems identifying factor 4, whose questions 8 and 9 were dispersed in factors 1 and 2 and presented loads lower than 0.45, whereas questions 5, 6, and 7 were located in factor 3 with loads lower than 0.6, thus affecting the indicators of the model and explaining only 59.4% of the variance.
For this reason, we performed another EFA, eliminating questions 8 and 9 because they had the lowest factor load. This analysis gave rise to Model 2 (M2, see Table 6). The percentage of explained variance increased to 61.6%, and TLI and RMSEA also improved slightly (see Table 3).
An additional EFA was performed to generate a third model (M3, see Table 6) in which the first three factors of the original questionnaire remained unchanged, thus eliminating all questions of the fourth factor (Q5 to Q9). Bartlett's sphericity test was significant (p < :001); the KMO index was 0.915, and the model explained 65.6% of the variance. Cronbach's alpha values for each factor are presented in Table 7 and compared with other published versions of this questionnaire. The loads of the questions in each factor are outlined in Table 8, whereas the correlations between the three factors studied are outlined in Table 9. The interfactor correlations were all lower than 0.6. Conversely, the explained variance of factor 1, 'not being able to communicate', was 27.7%; that of factor 2, 'losing connectedness' was 24.2%, and that of factor 3, 'not being able to access information' was 13.7%. In total, the three factors explained 65.6% of the variance.
The results of this study indicate that the questionnaire for measuring nomophobia with four dimensions proposed by [3] and translated into Spanish by [17] could be used in the population of Mexican university students in the field of social sciences. However, using only the first three dimensions improves the quality and adjustment indicators of the questionnaire. Thus, in this study, the use of the following dimensions is proposed: (1) not being able to communicate (Q10-Q15), (2) losing connectedness (Q16-Q20), and (3) not being able to access information (Q1-Q4). These three  A literature review shows that our study corroborates research by [12,13], and [7] because these authors also proposed measuring nomophobia using three dimensions and not four, as established by the original instrument. Accordingly, the fourth factor, 'giving up convenience', (Q5-Q9), which was excluded from our questionnaire proposal, had the lowest Cronbach's alpha values in the questionnaires by both [3,17,18], and [14], possibly indicating that questions 5-9 are likely dispersed or not strongly identified in other study populations, as found in the studies by [6,9]. These authors reported problems in questions 7 and 9, respectively, as in the studies by [7,13], and [12], in which questions 5 and 9 were mixed with others corresponding to other dimensions.
Our study had limitations related to convenience sampling, which only included undergraduate students in the fields of Information Technology and Administration. The inherent characteristics of this sector of the population could have influenced the fact that the fourth dimension of the original questionnaire was not consistent in our work. However, further research is required to determine this. In addition, our study did not include a translation process but rather used a previously published Spanish version of the questionnaire.

Conclusions
Nomophobia is a modern phenomenon that is becoming increasingly prevalent in our society. Therefore, it must be studied and addressed. The nomophobia questionnaire presented in this article is a reliable way of taking measurements, as indicated by the research results. In addition, other versions of this questionnaire have been validated in various languages. This study showed that nomophobia can be analyzed using three dimensions, not being able to communicate, losing connectedness, and not being able to access information. A fourth dimension, entitled 'giving up convenience' is reported in the literature. However, in this study, this dimension could not be clearly identified with the indicators included in the original questionnaire. For this reason, 'giving up convenience' was omitted from the final questionnaire. Nevertheless, this omission may not be valid in other study populations, as indicated by the existing body of theory. However, each population has its own background of culture, customs, and practices, and this may affect the identification of the dimensions in the questionnaire. Further research should deepen the study of measuring nomophobia and improve the instruments through other indicators and conceptual dimensions that help explain this phenomenon in a precise and reliable way. For example, we plan to explore the fear of losing the smartphone hardware and other related scenarios as well as the fear of not being able to use the smartphone due to getting a virus or being hacked. However, more qualitative and quantitative work is needed to further refine and justify these directions.

Data Availability
The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest
The authors declare that there is no conflict of interest regarding the publication of this paper.