Validation of the Spanish Version of Fear of COVID-19 Scale: its Association with Acute Stress and Coping

The COVID-19 is a “unique” stressor, which can produce physical and psychological trauma. Coping styles can buffer this psychological impact. Consequently, this paper aims to psychometrically adapt the Fear of COVID-19 scale (FCV-19S) to Spanish and examines the relationships between FCV-19S, stress response, and coping strategies. The sample comprised a convenience sample of 1146 participants (12–83 years), 880 from Spain (76.8%), and 266 from Dominican Republic (23.2%). Overall, the findings support a one-factor structure for FCV-19S, consisting of 7-items, and was invariant across age, sex, occupational status, and cross-national. Therefore, indicating evidences of construct validity. Evidences of reliability were also observed (Cronbach’s α = .86, McDonald’s ω = .86, Guttmann’s λ6 = .86, greatest lower bound = .91, composite reliability = .85, and average variance extracted = .44). Moreover, as regards criterion-related validity, the mediation analysis indicated that the relationship between FCV-19S and acute stress was positive and high, with maladaptive coping styles mediating the relationship, and with a stronger mediation for men. The findings give evidences of the reliability and validity of the Spanish version of FCV-19S among Spanish-speaker participants, which provides the chance of cross-cultural studies.

At the time (05/30/2020), the 5,796,257 confirmed cases of 483 deaths represent the reality of 216 countries around the world. The World Health Organization (WHO, 2020) reports that Spain has around 238,278 cases and 29,037 COVID-19-related deaths. Also, the Dominican Republic has 485 deaths out of 16,068 cases (WHO, 2020).
In a short period, COVID-19 has become a global pandemic that generates a huge economical  and psychological impact on the population (Mamun & Griffiths, 2020;Schimmenti et al., 2020;Wang et al., 2020a, b). Many people may experience fear, worry, and stress that affect their quality of life, as a consequence of the uncertainty about when an effective treatment or vaccine will be available (Harper et al., 2020;Satici et al., 2020). Also, some people may use maladaptive strategies such as alcohol and drug use (Lee, 2020).
Since its appearance in the city of Wuhan in December 2019, studies have been carried out to analyze the effect of this situation on the population. The decisions taken to prevent the spread of that disease, such as social isolation and/or quarantine (Chew et al., 2020) have been related to other psychosocial risks such as discrimination and stigmatization due to fear of contagion, according to what happened in previous pandemics such as SARS, Ebola, and H1N1 (Brooks et al., 2018;Lin, 2020), with emotional problems such as anxiety and depression with different levels of severity depending on the age (Huang & Zhao, 2020;Liang et al., 2020) and sex (Wang et al., 2020a, b;Zhang & Ma, 2020), and in different groups such as health professionals (Huang & Zhao, 2020). Furthermore, quarantine is the most predictive factor for symptoms of acute stress disorder and post-traumatic stress disorder (Brooks et al., 2020).
Considering that COVID-19 can be viewed as a unique stressor, according to the Lazarus and Folkman (1984) model of coping and stress, a high perceived impact and a low coping efficacy against the disease, tends to be associated with disarrangement in the perceived physical and psychological health (Cheng et al., 2006). According to Connor-Smith and Compas (2004), active coping responses directed with the stressor, or the thoughts and emotions associated with it, provoke a better adaptation. In contrast, avoidance or denial responses, which involve distancing oneself from the stressor and the thoughts, and emotions associated with it, were found to be associated with a worse adaptation process.
Recent studies focused on the impact caused by COVID-19 demonstrate the need to evaluate the fear response to this disease (Wang et al., 2020a, b), in order to develop effective interventions to cope with the situation and improve psychological recovery capacity (Wang et al., 2020a, b). Likewise, the possibility of measuring Fear of COVID-19 will be useful to analyze the consequences at a global level on populations' mental health and the possibility of finding differences between a variety of countries. Ahorsu et al. (2020) has developed a specific measure of Fear of COVID-19, the Fear of COVID-19 scale (FCV-19S) (Ahorsu et al., 2020). This is a 7-item questionnaire to assess the Fear of COVID-19. The FCV-19S scale (Ahorsu et al., 2020) has shown good psychometric properties such as internal consistency (α = 0.82) and acceptable test-retest reliability (ICC = 0.77). According to the Rasch analysis, its item separation reliability (0.99), item separation index (11.45), person separation reliability (0.77), and person separation index (2.82) were all satisfactory, indicating the test provides useful information about Fear of COVID-19. Six subsequent studies have supported their psychometric properties (Alyami et al., 2020;Bitan et al, 2020;Reznik et al., 2020;Sakib et al., 2020;Satici et al., 2020;Soraci et al., 2020).
The original study comprised 717 Iranian participants (> 18 years old). The authors reported invariance based on sex and age, as well as a significant relationship with depression (r = 0.42) and anxiety (r = 0.51) and with perceived infectibility and germ aversion of COVID-19 (r = 0.483 and r = 0.46, respectively).
Predictive models have also been carried out, where the Fear of Covid-19 predicts depression, anxiety, and depersonalization, as well as indirectly satisfaction with life through the mediation of anxiety and stress (Satici et al., 2020).
Some studies also indicate differences according to sex (higher scores in women) (Bitan et al., 2020;Reznik et al., 2020;Sakib et al., 2020;Tsipropoulou et al., 2020) and higher scores in university students vs. graduates (Reznik et al., 2020), while a single study indicates higher scores in people with low socioeconomic status, with chronic diseases, belonging to risk groups and with family members affected by COVID-19 (Bitan et al., 2020). Another study has showed that old people (over the age of 75), and participants with lower education displayed elevated Fear of COVID-19 (Tsipropoulou et al., 2020). Moreover, the study made by Reznik et al. (2020) indicates higher scores in Russian versus Belarusian participants.
The present study aims to assess the psychometric properties, reliability, and validity of the FCV-19S scale for the Spanish-speaking population. Specifically, we aimed to examine reliability estimates and evidences of construct validity (measurement model; measurement invariance and latent mean differences across age, sex, occupational status, and cross-national) and criterion-related validity by means of structural models to provide evidence of convergent-divergent validity describing the relations of FCV-19S with psychological impact (stress) and stress-coping strategies).

Participants and Procedure
The current cross-sectional study was part of the international cross-cultural study "Psychological Impact of Confinement by COVID-19 in Spain & Dominican Republic." The data were collected through online surveys. We reached 1405 participants, of which 1392 consented to participate voluntarily. Finally, 1146 cases were included in our study, as they had completed all the measures of variables under study and met the previously established inclusion criteria: (i) resident in Spain or Dominican Republic; (ii) aged 12 years or older; and (iii) being able to understand written Spanish. The mean age of the participants (N = 1146) was 35.39 years (SD ± 14.10). The 75.20% of the sample were females (n = 970), and around half of the participants were active employees (n = 636; 55.50%).
Specifically, participants were recruited from online advertisements, e-mail campaigns, blogs, social media, and SMS campaigns which covered the entire country. All procedures conducted were approved by the Ethics Committee of Miguel Hernández University (reference: DPS.JPR.01.20). Informed consent was obtained electronically before data were collected from the participants. Detailed information about the final sample for this study is presented in Table 1. Student subgroup included any kind of students, including university and vocational training students, as well as candidates for public office; active worker group consisted of full-time, part-time, employees, etc.; and inactive workers were unemployed, retired, housewife, temporary lay-offs of staff, etc.

Measures
In this study, measures of Fear of COVID-19, psychological impact (stress), and coping strategies were administered.

Fear of Covid-19
Spanish version of Fear of Covid-19 scale. The Spanish FCV-19S assesses Fear of COVID-19 and was adapted from the English version of the scale published by Ahorsu et al. (2020). As recommended in the Standards (AERA, APA, and NCME, 2014), an iterative process involving translation and English-Spanish back translation was used. The screening tool consists of seven items (e.g., "I cannot sleep because I am worried about getting Covid-19") with a 5-item Likert point response from 1 (strongly disagree) to 5 (strongly agree). The total score ranges from 7 to 35, with higher scores indicating a higher level of Fear of COVID-19. The psychometric properties of the Spanish version of FCV-19S are presented in the "Results" section.

Psychological Impact: Acute Post-traumatic Stress Disorder
Impact of event scale-revised The psychological impact of COVID-19 was measured using the IES-R (Weiss, 1996). The IES-R is a 22-item questionnaire with 4-point Likerttype scale (0 = not at all, 1 = rarely, 3 = sometimes, 4 = often) composed of three subscales: avoidance, intrusion, and hyperarousal. The IES assesses subjective distress resulting from a traumatic life event. The Spanish version by Baguena et al. (2001) was administered, which has shown good psychometric properties. Alpha coefficient was 0.92 for the total score in this study.

Coping Strategies
The Brief Coping Orientation to Problems Experience COPE-28 is an inventory of 28 items assessing how people handle stressful situations (COPE-28; Carver, 1997; Spanish adaptation of Morán et al., 2010). It measures 14 different stress-coping strategies using 28 questions (two questions for each strategy), which were clustered into adaptive or maladaptive strategies, as previously studies have defined (Carver, 1997;Connor-Smith & Compas, 2004;Kasi et al., 2012): adaptive stress-coping was formed by religion; active coping; planning; acceptance; positive reframing; instrumental support; emotional support; and humor; and maladaptive stress-coping included behavioral disengagement; denial; self-distraction; self-blame; substance use; and venting. Each question is answered using a 4-point Likert-type scale, ranging from 0 (I never do) to 3 (always do this). The maximum score of adaptive stress-coping is 64 points (16 questions covering eight strategies) and the maximum score of maladaptive stress-coping is 48 points (12 questions covering six strategies). Alpha coefficients were 0.68 for maladaptive stress-coping and 0.80 for adaptive stresscoping strategies in this study.
Slight adaptations were performed from the versions of IES-R and COPE-28 (changing verbal tenses where needed) to account for the nature of the stressful event explored and coping in response to COVID-19.

Analysis
In order to validate the FCV-19S, analysis of psychometric properties included item analysis, reliability estimates (corrected item-total correlation, Cronbach's α, McDonald's ω, Guttmann's λ6, composite reliability, and average variance extracted), and evidences of validity (construct validity: measurement model, measurement invariance across, latent mean differences; and criterion-related validity, specifically convergent-divergent validity by means of a structural model).
Structural equation model (SEM) was used to test the measurement model, measurement invariance, and latent mean differences across age, sex, country of residence, and occupational status (Byrne, 2006). SEM also was used to test structural model to describe the relations between characteristics of interest and provide evidences of convergentdivergent validity (variables: FCV-19S and measures of psychological impact (stress) and stress-coping strategies). All analyses, CFA and SEM, were carried out using the method of robust maximum likelihood (robust ML). We reported the following indices: chi-square (χ2), Satorra Bentler Chi-square (S-B χ2), robust root mean square error approximation (R-RMSEA), robust comparative fit index (R-CFI), and standardized root mean square residual (SRMR). For RMSEA, values less than 0.06 indicate a good fit model (Schumacker & Lomax, 2004). The R-CFI value indicate good fit with values greater or equal to 0.95 (Bentler, 1990), while the SRMR values are good with lower values to 0.08, and it is considered acceptable when values approach 0.10.
Factorial invariance of the model (FI) was analyzed following the procedure suggested by Byrne (2006), according to which the measurement invariance applies to (a) validity of the configural model (M0, base line model, no constrains), (b) metric invariance (equal factor loadings across groups, M1), (c) scalar invariance (equal item intercepts across groups, M2), and (d) item uniqueness invariance (equal item error variances/covariances across groups, M3). When the strong measurement invariance (metric and scalar) is reached, the comparison of latent means is justified. According to the methodology proposed by Cheung and Rensvold (2002), we reported R-CFI, ∆CFI, R-RMSEA, and SRMR. A value of ∆CFI smaller than or equal to 0.01 indicates that the null hypothesis of invariance should not be rejected. After these considerations, the calculations to compare the latent means across sex were carried out.
The analyses were carried out using the following statistical packages: IBM SPSS 25.0 (IBM Corp., Armonk, NY), EQS 3.0 and JASP 0.11.1.

Descriptive Data
Item analysis results for FCV-19S are given in Table 2. Most items had skewness and kurtosis values within the ± 2.0 range, but items 3 and 6 showed kurtosis higher than 4, not confirming that they were normally distributed (Table 2 and Fig. 1). Mean score of FCV-19S was 15.17 (SD = 5.88).

Measurement Model
CFA analysis showed adequate fit values for the entire sample and across sex, age groups, country of residence, and occupational status (see Table 3). However, certain indices, such as the R-RMSEA were somewhat higher than 0.06, specifically for the 30-39-year-old group and the student's group. This values only indicate an acceptable fit model (Schumacker & Lomax, 2004), but the remaining values were adequate. The R-CFI value indicate good fit with values greater or equal to 0.95 (Bentler, 1990), while the SRMR values are good, with lower values to 0.08. Fit indices were all within the acceptable limit and factor weights between 0.47 and 0.86 for the total sample and across groups (see Table 4).
The analyses indicated that the measure was invariant according to age, sex and country of residence (see Table 5), so that we can assert that measurement invariance was reached for all comparisons.
Since the strong measurement invariance (metric and scalar) was reached, the comparison of latent means across sex, age, country of residence, and occupational status was justified. As can be seen in Table 6, results showed higher means on Fear of COVID-19 for females, for Dominican participants and for workers versus students. Regarding differences between age groups, the extreme groups had the lowest scores of Fear of COVID-19, which is adolescents and the elderly. Therefore, lower scores were found for adolescents compared to the rest of age groups, except for older than 60. The 20-29 group had lower scores than the 40-49 one, but higher than the older than 60 s. The 40-49 group also showed higher scores than the older than 60 s global score of stress residence groups on Fear of COVID-19.

Path Models
To further examine the associations among Fear of COVID-19 and psychological impact (stress) as well as the role of a protective variable (stress-coping strategies), a structural model was conducted (see Table 7, and Fig. 1). Before performing the path analysis, we analyzed the correlation matrix of the FCV-19S with the IES-R and COPE-28. The correlation matrix showed that the FCV-19S score was associated with psychological impact measured as global score of stress by IES-R (0.59), as well as with maladaptive coping strategies (0.25) of COPE-28. There was not association with adaptive coping strategies (− 0.03).
As expected, the analysis revealed a good fit to the data when we entered Fear of COVID-19, psychological impact, and only maladaptive stress strategies, not when both adaptive and maladaptive strategies were included (see models 1 in Table 7).
The theoretical model can be seen in Fig. 1. The contrasted models for the entire sample, and for both men and women can be seen in Fig. 2. For the total sample, the relationship between Fear of COVID-19 and psychological impact was significant (percentage of variance explained = 72%), with mediating effect of maladaptive coping strategies. For men, the relationship was even stronger (74%), being the role of maladaptive stress-coping higher than direct effect, while for women there was a stronger direct effect between Fear of COVID-19 and impact, along with an indirect effect through maladaptive coping strategies. The model for women explained 63% of the total explained variance. Table 5 Invariance constraints for the Fears COVID-19 SBχ 2 , Satorra-Bentler scaled chi-square; R-CFI, robust comparative fit index; R-RMSEA, robust root mean square error of approximation; CI, confidence interval; SRMR, standardized root mean square residual; ΔR-CFI, R-CFI difference; M0, free model (baseline); M1, M0 with invariant factor loadings; M2, M1 with invariant intercepts; M3, M2 with invariant factor variances and covariances

Reliability Estimates
After the confirmatory factor analysis, different types of reliability (i.e., internal consistency) were investigated to analyze the reliability of the measure and internal consistency. Therefore, all items (see Table 2) had positive and acceptable corrected item-total correlation (0.54 to 0.70), within the range recommended between 0.20 and 0.70. by Streiner et al., (2015, p. 84). The internal consistency estimates of the FCV-19S in the entire sample was Cronbach's α = 0.86, McDonald's ω = 0.86, Guttmann's λ6 = 0.86, Greatest lower bound = 0.91, composite reliability = 0.85, and average variance extracted = 0.44. Estimates values for each subgroup were high and equivalent to the entire sample, in all cases with internal consistency estimates higher than 0.84 (see Table 3).

Discussion
The COVID-19 pandemic is undoubtedly the greatest current health and economic problem for humanity Lei et al., 2020;Peng et al., 2012).
There is no doubt that the disease has an impact on physical health, but a growing number of studies indicate that the impact on mental health is also being felt (Huang & Zhao, 2020;Lai et al., 2020;Lei et al., 2020). For these reasons, having assessment tools to investigate the effects of COVID-19 on people's mental health is relevant.
As regards factorial invariance, our study confirms invariance by sex and age, consistent with Ahorsu et al. (2020) or Sakib et al. (2020), and extend knowledge on the invariance across country of residence (Spain and Dominican Republic), and occupational status (students, active population, and inactive population).
Finally, validity evidences indicate that Fear of COVID-19 is a predictor of acute posttraumatic stress disorder, although there is mediation by maladaptive coping strategies that explain part of the effect of the relationship. This finding supports the concurrent validity of the instrument and is consistent with other data on predictive models, in which the Fear of COVID-19 predicts depression, anxiety, and depersonalization, as well as indirectly life satisfaction, through the mediation of anxiety and stress (Satici et al., 2020). The correlation between FCV-19S and stress and maladaptive stress-coping strategies, with an effect size large and medium, respectively, were also coherent with previous data that show FCV19S total score is associated with anxiety, depression, stress, and behavior change and quality of life-related variables (Alyami et al., 2020;Bitan et al., 2020;Sakib et al., 2020;Satici et al., 2020;Soraci et al., 2020;Tsipropoulou et al., 2020), also with effect size between medium and large.
Similarly to previous studies (Bitan et al., 2020;Reznik et al., 2020;Sakib et al., 2020;Tsipropoulou et al., 2020), we found that the Fear of COVID-19 was higher for females. However, we did not find higher scores in undergraduates vs. graduates as reported by Reznik et al. (2020), but we did find higher scores in middle age adulthood versus adolescents, emerging adulthood and elderly as well as in active workers versus students. Our data did not support the finding by Tsipropoulou et al. (2020), who reported higher scores on Fear of COVID-19 for the elderly and people with lower education. Participants from Dominican Republic also showed higher scores than Spaniards. Reznik et al. (2020) also found differences between Russian versus Belarusian participants. Anyway, in all cases, the differences were small.
It is worth mentioning that this study is not exempt from some limitations, such as having followed a convenience sampling, carrying out the analyses with a sample where women are more represented, where the population of Spain is also more represented and where not all the variables that may be affecting the Fear of COVID-19 have been controlled. Even so, the sample is large, the origin is varied, and it can be said that it has allowed the test to be validated.
In summary, this study has at least 4 new contributions: to make available to the Spanishspeaking community, the second worldwide in extension, a measure that allows the assessment of Fear of COVID-19; to provide evidence of validity and estimates of reliability that support the psychometric properties of the measure in people between 12 and 83 years, extending the range of applicability of the measure, since for the first time it has been applied to people under 18 years; it supports the unidimensional structure of the measure; and it provides support for the relationship between Fear of COVID-19 and acute post-traumatic stress disorder, taking into account a mediating variable such as coping strategies. are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http:// creat iveco mmons. org/ licen ses/ by/4. 0/.