This study aimed to develop a scale to measure continued employability among people with mental illnesses and examine how to support them as they strive for continued employment. We examined the reliability and validity of the Continued Employability Scale, support for continued employability, and the application of the scale.
4.1. Reliability and Validity of the Continued Employability Scale
Cronbach’s α for the 19 items of the Continued Employability Scale was 0.894, while Cronbach’s α for each subscale was ≥0.75, signifying sufficient reliability.
Subsequently, we examined the construct validity of the Continued Employability Scale for people with mental illnesses. The scale was confirmed to consist of a four-factor structure: self-management, dedication to work, adjustments in the environment, and expression of sincerity. Factor 1, self-management, showed the importance for people with mental illnesses to objectively view their own symptoms and condition and make necessary adjustments, making this the most crucial of the four factors. Self-management was highly correlated with all five subscales of consequences of continued employment (attaining independence, developing interpersonal relationships, improvement and maintenance of self-care, achieving happiness, and positive self-transformation), demonstrating the importance of self-management. Furthermore, self-management corresponds to the ability to self-manage, as found in an earlier conceptual analysis [
14], to be involved with the continuation of work, and was the core of continued employability. Additionally, self-management improvement betters both job performance and self-efficacy [
18,
19], suggesting that self-management affects various elements of work continuation.
Factor 2, dedication to work, shows the importance of focus in one’s work. People with mental illnesses characteristically have difficulty focusing on their work due to their mental symptoms [
20]. Workers must perform their duties while dealing with risks as they strive for their workplace benefits and their own independence [
14,
21], an important aspect of which is to focus on work with enthusiasm. Regardless of mental impairments, dedication to work may be an indispensable ability for continued employment.
Factor 3, adjustments in the environment, shows the importance of people with mental illnesses having others at their workplace adjust their duties according to their symptoms. This factor corresponds to the ability to adapt, abstracted in our previous conceptual analysis [
14], and formed the foundation of continued employment alongside self-management. Workers who suffer severe psychosocial stress at work may quit before experiencing a deterioration in their health condition and are forced to take sick leave; notably, working arduously may exacerbate this stress [
9]. People with mental illnesses require the cooperation of those around them to avoid the difficulties posed by their symptoms as they perform their duties [
22]. Therefore, when changes in symptoms hinder work, people with mental illnesses may need to consult with others at their workplace and adjust their environment to continue working.
Factor 4, expression of sincerity, wherein gratitude and apology were abstracted, was positively correlated with the five items of consequences of continued employment and vital for continued employment. Expression of sincerity builds smooth interpersonal relationships through gratitude and apology and is a crucial social skill for solving problems at work [
7,
23]. To continue working, people with mental illnesses must cooperate with their workplaces’ human resource departments and mental health teams [
24] and manage their own workspace to enable them to control their work [
25]. Therefore, understanding the workplace environment and personal coping strategies are necessary for continued employment. Thus, while self-management and environmental adjustments are crucial for continued employment, building interpersonal relationships that enable such adjustments may also be important. This study demonstrated that in addition to self-management and adjustments in the environment, expression of sincerity is also crucial for continued employment; specifically, work was shown to require gratitude, apology, and other basic social skills to enable smooth self-management and adjustments in the environment.
Therefore, for people with mental illnesses to work continuously, they must adjust their environment while expressing sincerity with a foundation of self-management and dedicate themselves to their work with the cooperation of those around them to avoid taking on more than they can handle. Additionally, the ability to formulate plans, as found in our previous conceptual analysis [
14], was included in Factor 1 (self-management) and was not abstracted as a factor in the present study. Planning may have been treated as an ability exercised under self-management. In summary, the factor structure, which comprised self-management, dedication to work, adjustments in the environment, and expression of sincerity, was determined to be valid. Moreover, the Continued Employability Scale developed in this study demonstrated positive correlations with the above and among its subscale factors, indicating that construct validity was achieved.
Subsequently, we examined the criterion validity of the four-factor, 19-item Continued Employability Scale with career change (yes/no) and consequences of continued employment as external criteria. The Continued Employability Scale score differed significantly based on whether participants had changed careers and was positively correlated with consequences of continued employment, supporting the criterion validity of the scale.
Based on the above, the Continued Employability Scale, developed to measure the potential for people with mental illnesses to work continuously without leaves of absence, was determined to be reliable and valid, signifying that its factor structure is valid as a scale for assessing continued employability.
4.2. Application of the Continued Employability Scale
The scale developed in this study for assessing continued employability among people with mental illnesses was confirmed to be reliable and valid. The scale, which can determine self-management, dedication to work, adjustments in the environment, and expression of sincerity necessary for continued employment, is a valuable and applicable tool for assessing the ability to continue working. People with mental illnesses can use the scale to reflect on what they need to work on continuously. Such reflection could enable them to realise the abilities they need and think about what they should do to improve their ability to work. Objective and subjective assessment can improve job performance [
18]. Therefore, allowing people with mental illnesses to visualise their own continued employability clarifies what is being assessed and can help improve the self-management ability necessary for continued employment.
In addition, people with mental illnesses cannot attain this ability with assessment alone. People with mental illnesses are limited in how much they can manage themselves and, therefore, require understanding and support, such as through consultation with others, to continue working. As demonstrated in our previous conceptual analysis [
14], a workplace that believes in the employees’ abilities, has a support system, and a sense of security is an essential prerequisite for continued employment [
26,
27,
28]. For example, Factor 3, adjustments in the environment, was characterised by people with mental illnesses appealing to supervisors and colleagues to adjust their environment to continue working. As such adjustments may not be achieved merely by people with mental illnesses asking for them at their workplaces personally, Factor 3 is predicated on the idea that the work environment already enables adjustments and the understanding of others. A work environment without sufficient understanding of the work ability of people with mental illnesses is predicted to increase their burden. Therefore, a shared understanding of continued employability between people with mental illnesses and their workplaces may provide an opportunity to re-examine specific, necessary support and the work environment and could help improve the work environment. Care from staff both within and outside businesses already exists as employee assistance programs, comprising both care for individual productivity and systematic care [
29,
30,
31]. In the United Kingdom, employment advisors provide decision-making support for job adjustment, and initiatives have been undertaken to achieve desired outcomes [
32]. Additionally, active listening, which involves paying attention to the speaker, understanding them, and sympathising with them, is crucial in interpersonal relationships for many jobs [
33]. Thus, a deeply rooted culture wherein people with mental illnesses can seek help, and the workplace provides organised support may be critical for continued employment.
The above indicates that the Continued Employability Scale allows both people with mental illnesses and those who support them at work to visualise the ability to continue working and can therefore be applied as an accessory tool to enable existing support and programs to function effectively.