The results of the present study showed that ethical leadership has a positive relationship with several factors, namely moral courage, individual and organizational citizenship and the intention to leave the job, the influential role of internal motivation, self-efficacy in nurses, clinical governance, and psychological empowerment. In addition, it showed that as the experience of nurses increases, their moral leadership score increases; therefore, the age of nurses has a positive relationship with the moral leadership score, and there is a positive relationship between the level of moral leadership of nursing managers and errors. - The results were indicative of a high level of ethical leadership among nurse managers (
30,
32,
33). Additionally, the studies conducted in other countries, such as Turkey and Finland, reported an appropriate level of nursing ethical leadership (
41,
42). A study conducted in Finland proved that nursing managers consider ethical leadership in their routine tasks (
42). However, one of the included studies showed a moderate level of ethical leadership among nurse managers (
31).
The evidence points to a negative association between turnover rate and ethical leadership (
37). Moreover, one study addressed the relationship between ethical climate and ethical leadership (
32). Other studies have also shown that an ethical climate is effective in the intention to leave and turnover. Likewise, some factors, such as interpersonal relations, stress, emotional burnout, confidence in the supervisor, and job satisfaction, are in direct association with ethical climate (
43). Notably, ethical climate should be addressed as a tool to establish ethical values by nurse managers. In this way, more support, unification, and formation of professional values are observed (
44). Some studies claimed that gender and age are two principal factors that might alter the score of the ethical climate among nurses (
45).
Seemingly, numerous studies claim that ethical problems in nurse managers pertain to nursing staff. For instance, ignoring orders and a lack of honesty can cause many ethical issues. To solve this problem, nurse managers should be in direct relation with nurses and even patients. In this way, many problems are automatically eradicated (
46,
47). The problems related to patients usually originate from requesting their rights and autonomy as nurses assume they can decide what is the best choice for their patients (
48). Elsewhere, a significant correlation between nurses’ conscientiousness and ethical leadership was shown (
27). This finding is in line with the finding of another study, which claimed ethical leaders can affect the credibility and conscientiousness of employees (
24,
49).
Another finding showed that ethical leadership directly affects organizational citizenship (
29). Likewise, another study conducted in China showed that ethical leadership encourages employees to maintain mutual relationships and prioritize ethical values. Ethical leaders motivate employees toward compliance with the principles of organizational citizenship (
50). Furthermore, it is claimed that organizational commitment is in direct relationship with organizational citizenship (
51). This finding is in line with the findings of other studies (
52). However, a study conducted in China proved that there is no significant association between ethical leadership and organizational citizenship (
53). It is proven that organizational support can be effective in improving the level of organizational commitment. For instance, job promotions or support from managers are two ways to elevate the level of organizational commitment (
54).
One of the findings showed that there is a direct relationship between ethical leadership and psychological safety (
35). Other studies have also shown leaders can affect the psychological safety of individuals. Respect, support, and sympathy from ethical leaders are effective factors in the improvement of psychological safety (
55). In addition, the findings of this systematic review proved there is a significant association between ethical leadership and job satisfaction among nurses (
34). Moreover, other studies have shown that there is a positive association between job satisfaction and ethical leadership, as unpleasant issues are normally decreased after considering ethical values (
56). According to Bandura’s theory, improving job satisfaction can lead to higher efficacy in any organization. It is the employees who play a key role in shaping the provided services (
14).
One of the findings was related to having five kinds of sensitivity for ethical nurse managers (
24). It is argued that cognition can lead to sensitivity regarding ethical factors. It is believed that the awareness of ethical factors does not matter; however, an increased level of cognition is a way to analyze and infer them (
57). Another imperative component pertains to commitment, as it can play the role of a motivator toward compliance with ethical principles. Therefore, it might increase ethical sensitivity (
58). Furthermore, demographic factors are highlighted in shaping the sense of commitment. When an individual is committed, he/she tries to act based on some determined attitude (
58).
4.1. Strengths and Limitations
The main strength of this study covering the relationship between ethical leadership and nursing is that a sensitive study with few limitations was conducted. Manual searching and snowball methods were used to diminish the number of missing data.
Some limitations need to be addressed. First of all, four databases were searched, and the language was limited to English and Persian. Although some studies had methodological flaws, the heterogeneity of the included studies was considered in terms of participants, exposure, and desired outcome. Furthermore, the full text of some eligible studies was not available. Moreover, the study was not a meta-analysis, and it is difficult to judge the quality of the findings. Despite the restrictions, this systematic review presented valuable information on the importance of ethical leadership in nursing.
The results of the study showed that ethical leadership has a positive relationship with moral courage, individual and organizational citizenship and the intention to leave the job, the influential role of internal motivation, self-efficacy in nurses, clinical governance, and psychological empowerment. This review aimed to elucidate the importance of ethical leadership in the nursing profession. The findings were indicative of the undeniable role of ethical leadership in various fields. By showing a combination of honesty, trustworthiness, purity, democratic decision-making, supportive participation, compassion, kindness, justice, compliance with ethical cultures, and reducing job stressors, nursing managers can increase the organizational commitment of nurses and reduce turnover intention. It is recommended to employ managers who possess this style of leadership.