A Study on the Expected Retirement Age Prediction of 1049 Nurses and the Influencing Factors of Delayed Retirement Intention

The results were analyzed by unconditional logistic regression. The analysis results showed that the positions entered into the regression model (OR = 2.339); the expected retirement age (OR = 3.280); and delayed retirement can better solve the pension problem (OR = 0.553). Retirement can relieve child financial pressure (OR = 0.217), emotional exhaustion (OR = 0.913) and social opportunities (OR = 1.132). The OR of job title, expected retirement age, and social opportunities is greater than 1, and the others are less than 1. Conclusion: The most expected retirement age for nurses is 50 to 55 years old, and they are more inclined to retire early. Factors affecting the willingness to postpone retirement include position and expected retirement age. Postponement of retirement can better solve pension problems. Postponement of retirement can alleviate child financial pressure, social opportunities and emotional exhaustion.

items. The content includes: Are you willing to postpone your retirement age, whether you are willing to continue your job, are you willing to re-employ after retirement, position, promotion space, busyness of work, family monthly net income, number of dependents, current living standards, current health circumstances, I feel that the job salary is high, I am worried that losing my original working relationship after retirement will lead to a monotonous life, the expected retirement age, delayed retirement can more effectively use human resources, delayed retirement can better solve the pension problem, delayed retirement age can relieve children Whether economic pressure, medical disturbances or medical violence affect the willingness to delay retirement, etc.

Nurse Job Satisfaction Scale
The McCloskey/Mueller Satisfaction Scale (The McCloskey/Mueller Satisfaction Scale, MMSS) [5] is currently the most widely used and has been proven to have good reliability and validity, including welfare benefits, shifts, family and work balance, Relationships between colleagues, social opportunities, opportunities to do part-time jobs, job recognition, professional development, and control and responsibility for work, totaling 31 items. According to the Likert scale five-level scoring method, it is divided into five levels from 1 to 5, among which are very satisfied (5 points), relatively satisfied (4 points), neither satisfied nor dissatisfied (3 points), and not very satisfied (2 Score), very dissatisfied (1 point), the higher the score, the higher the job satisfaction.

Nursing Burnout Scale (NBS) [6]
The Nurse's Job Burnout Scale has 3 dimensions and 15 conditions, including 7 questions about emotional exhaustion; 3 questions about depersonalization; and 5 questions about less sense of accomplishment. The scores of the three dimensions are independent of each other and cannot be added. The scores of each dimension are the average score of all items in this dimension. In terms of emotional exhaustion and depersonalization, the higher the score, the stronger the degree of burnout; in the aspect of less accomplishment, the higher the score, the weaker the degree of burnout.

Conduct Pre-Survey
A pre-survey of 56 nurses in a hospital was conducted on November 2, 2015 and November 16, 2015, to check the reliability and validity of the scale, and make a preliminary analysis to increase or decrease influencing factors. The reliability of the Cronbach's coefficient of the nurse job satisfaction scale was 0.937, the split-half reliability was 0.789, and the repeat reliability was 0.914. The reliability of the Cronbach's coefficient of the Nurses' Burnout Scale was tested to be 0.764, the split-half reliability was 0.750, and the repeat reliability was 0.846. Using factor analysis to test the validity of the structure, the results show that the nurse job satisfaction scale has 8 dimensions and the nurse job burnout scale has 3 dimensions, which are consistent with the original author's entries. Therefore, each scale has high reliability and validity.

Data Collection
From December 1 to 31, 2015, nurses who meet the selection criteria were selected for investigation. First, give a unified instruction, and then the head nurse of the investigation department will distribute the questionnaire collectively, and complete the questionnaire independently as required to ensure the authenticity and completeness of the questionnaire. It takes about 20 minutes.
Items with missing items greater than 5 are eliminated. A total of 1100 questionnaires were distributed this time, and the unqualified questionnaires were eliminated, 1049 valid questionnaires were obtained, and the effective response rate was 93.36%.

Statistical Methods
After summarizing the data, first encode, quantify, and assign values, and then use epidata3.0 to double-enter the data. Use SPSS19.0 statistical software for statistical analysis, use relative numbers for descriptive analysis, and compare the means of measurement data between two groups and more than two groups that obey a normal distribution (normality test uses Kolmogorov-Smirnov method), using t test. And the analysis of variance, the comparison of the measurement data of the two groups and more than two groups that do not obey the normal distribution uses the rank sum test. The correlation analysis of grade data uses rank correlation analysis. The dependent variable is binary or graded data using single factor unconditional logistic regression to analyze, and the dependent variable is binary or graded data using multiple factor unconditional logistic regression (factor screening method forward condition) for factor screening, and the test level is 0.05.

General Situation of the Research Object
There were 1049 subjects, 31 males and 1018 females. The male to female ratio was 3:97, the average age was 37.98 ± 7.32 years, and the average nursing age was 17.05 ± 8.41 years. The analysis of the presence or absence of administrative positions showed that there were 876 nurses (83.5%) without administrative positions, 153 (14.6%) head nurses, and 20 head nurses and above (1.9%). See Table   1 for the rest.

Expected Retirement Age for Nurses
A histogram is used to statistically describe the expected retirement age of nurses.
The results are shown in Figure 1. The most age group is 50 -55 years old, 659.  ( )

Single Factor Logistic Regression Analysis of General Factors of Delayed Retirement Intention
Taking the willingness to postpone retirement as y (1 = not willing; 2 = General; 3 = willing), the promotion space, the degree of busy work, the monthly net income of family, the number of relatives under 14 years old and above 64 years old, the current living standard, the current physical health condition, the monotonous life caused by worrying about losing the original working relationship after retirement, the expected retirement age and delayed retirement can be more effective. Using human resources, delaying retirement can better solve the pension problem, and delaying retirement can relieve the economic pressure of children as independent variables, and the cumulative advantage logistic regression is used for analysis. The factors with statistical significance are shown in Table 2.

Comparison of Various Dimensions and Total Scores of Job Satisfaction among Nurses Who Are Unwilling to Retire and Willing to Retire
The t test was used to compare the various dimensions and total scores of job satisfaction among nurses who were unwilling to retire and those who were willing to retire. The results showed that, except for the relationship between colleagues and the management model and work recognized, other items were statistically S. P. Zhou et al. Health significant. The scores of delayed retirement were higher than those of unwillingness to delay retirement. The results are shown in Table 3.

Comparison of Various Dimensions and Total Scores of Job Burnout between Nurses Unwilling to Retire and Willing to Retire
The t test was used to compare the various dimensions and total scores of nurses' job burnout between unwilling to retire and willing to retire. The results  showed that, except for less sense of accomplishment, the differences in other items were statistically significant, and the scores of unwillingness to delay retirement were all higher than willingness delay retirement. The results are shown in Table 4.

Multi-Factor Analysis of Factors Affecting Nurses' Delayed Retirement Intention
On the basis of the statistical significance of the above factors, taking into account the professional significance, the job, current health status, expected re-  Table 5.  The rational use of senior nurses in nursing work is a difficult point in nursing human resource management [9]. Senior seniority expects to retire at the age

The Impact of General Conditions on Nurses' Willingness to Delay Retirement
The analysis results show that the longer the age, working years and current working experience, the more willing to delay retirement. Nursing is a discipline, and nursing work is closely related to the quality of life. As a professional worker in the nursing discipline, nurses need to have professional operating skills. In clinical nursing work, elderly nurses will have difficulties with some nursing skills such as puncture, drug label checking and night shift due to physiological problems. Because elderly nurses already have high nursing professional know- This is similar to Yu Cui Ting et al. [4] have consistent research on college teachers. The definition of health refers to having a healthy physical and mental health, as well as good social adaptation. A healthy physique is the basic condition for human existence. Without a good body, everything is impossible to talk about. This study shows that the more busy the work and the worse the health, the stronger the willingness to delay retirement, which is consistent with common sense. The goal of nursing work is to promote and maintain people's health, but it must be on the premise that nurses should have good psychological and physical health. Nurses in the hospital to undertake a lot of nursing work, night shift rotation, long-term in a high degree of mental tension, easy to produce psychological and physical fatigue [10] such as lumbar disc herniation, muscle soreness, varicose veins, chronic fatigue and other physiological problems, anxiety, depression and sleep disorders and other psychological problems, these problems lead to the lack of enthusiasm for work, and reduce the efficiency and quality of work. Nursing work not only requires nurses to have professional knowledge and skills, but also needs to have the ability to deal with emergencies and the rotation of various shifts. Therefore, without a strong physique, they will not be competent for nursing work. If the implementation of delayed retirement, in the departments with more critical patients and serious treatment tasks, such as emergency department, ICU, etc., nurses are in high pressure and poor health for a long time, even if the nurses want to delay retirement on their subjective will, their physical condition will not allow them to carry out high-quality work tasks. Delaying retirement can effectively utilize human resources, delay retirement can better solve the pension problem, delay retirement can relieve the economic pressure of children, and there is a significant negative correlation between delayed retirement intention and delayed retirement intention. After many years of working practice, nurses have the skilled clinical nursing skills. If the value of retired nurses is reflected, they have the opportunity to continue to contribute to the society, and can also be used as one of the teaching staff for young nurses training. Delaying retirement means working longer hours and paying more pension, while shortening the number of years to receive the pension, that is, reducing the state expenditure, can solve the problem of insufficient pension. The economic income of on-the-job is higher than that of retirement, so delaying retirement can relieve the economic pressure of children.
S. P. Zhou et al.

The Influence of Job Satisfaction on Nurses' Willingness to Delay Retirement
The results of univariate analysis showed that there were statistically significant differences between the six dimensions of professional development and job control and responsibility, satisfaction with shift scheduling, social opportunities, welfare benefits, part-time job opportunities, family and work balance, and nurses' willingness to delay retirement was higher than that of unwilling to delay retirement. As a clinical front-line staff, nurses are one of the most important components of the hospital, and are the main force of nursing development.
Their work enthusiasm directly affects the nursing quality and organizational development [11]. Relevant studies at home and abroad show that nurses' job satisfaction is highly correlated with medical service quality, work efficiency, nurse turnover rate and patient satisfaction [12] [13] [14] [15]. Welfare is one of the important factors that determine job satisfaction. It can not only meet the basic needs of nurses' life and work, but also respect their contributions. It is a symbol of personal achievement and social status [16]. The labor intensity and risk of nursing work are increasing, but the value of nursing service is not reflected in nursing fees and nurses' remuneration. Nurses will compare their work and remuneration with others, and they will be dissatisfied with welfare treatment. Some studies have found that dissatisfaction with income is one of the main reasons for nurses' turnover [17]. To improve the job satisfaction of nurses, the primary problem is to scientifically evaluate the value of nursing services, and establish a fair and reasonable salary system and welfare system [18].
The results of multivariate analysis showed that social opportunities were the factors influencing nurses' willingness to delay retirement. With the development of economy and the improvement of living standards, the construction of nursing team is constantly strengthened and improved, and the degree of nurses is also higher and higher, and the spiritual needs are also improved. Social opportunities are necessary for human survival. One of the factors that attract nurses to delay their retirement is to get social recognition from the society, to have more opportunities to participate in social activities and to communicate with non nursing professionals. Due to the requirements of the national system, most of the families are only children, and there are not too many relatives to accompany them. Nurses expect to communicate with colleagues more after work, which is also one of the ways to reduce stress. Nurses feel that there are many opportunities for nurses to integrate into the society, and they can participate in social activities with colleagues after work, which are the factors that promote nurses' willingness to delay retirement. Therefore, more interactive activities should be carried out to enhance the cohesion among colleagues. Learning and communication is the main way for nurses to participate in continuing education. It is necessary to provide opportunities for nurses to learn and exchange, which is conducive to promoting nurses' desire for learning, instead of losing enthusiasm for their own work due to their old age. Social intercourse in-

Effect of Job Burnout on Nurses' Willingness to Delay Retirement
There were significant differences between emotional exhaustion, depersonalization and willingness to postpone retirement. The scores of unwilling to postpone retirement were higher than those willing to postpone retirement. Job burnout is the exhaustion state of emotion, attitude and behavior produced by individuals under long-term pressure experience [19]. This is manifested as extreme fatigue, loss of enthusiasm for work, and lack of efficiency and sense of achievement [20]. Nurses' job burnout will lead to reduced work ability and affect the quality and safety of nursing work [21]. Job stress and social conflict are mainly related to emotional exhaustion and depersonalization [22]. Some foreign studies have pointed out that medical staff lack of interpersonal communication skills, dissatisfaction with their superiors, and conflicts with colleagues are also related to job burnout [23]. The results of multi factor analysis showed that emotional fatigue was the influencing factor of delaying retirement intention, and the possible reason of fatigue was that the nursing work task of Grade-A hospital was heavy, and it was a work with high-intensity pressure, which was prone to occupational burnout [23] [24]. Most of the research objects in this study are intermediate professional titles. After years of training and clinical practice, these nurses are the business backbone of the Department and are responsible for the nursing work of critical patients. Therefore, it is easy to produce job burnout, affect the nurses' work enthusiasm and career achievement, which leads to high turnover intention.
Wang Shuhui et al. [24] research shows that there is a negative correlation between nurses' Job Burnout and social support. Having social support is effective in alleviating nurses' job burnout. Learning positive coping strategies can cope with their emotional distress, help nurses cope with pressure actively, and encourage them to face heavy work with a positive attitude. Strengthening the use of social support, improving nurses' experience of success and self achievement, encouraging and praising the progress of nurses are the key to reduce their exhaustion.

Position has an Effect on the Intention of Delaying Retirement
In the multi factor analysis, the results show that job, expected retirement age and delayed retirement can better solve the pension problem, and delayed retirement can alleviate the economic pressure, emotional fatigue and social opportunities of children. The OR of position, expected retirement age and social opportunity is greater than 1, and the others are less than 1. Studies have shown that the willingness of nursing managers to stay on duty is higher than that of nurses [25]. The higher the position, the more willing to delay retirement. High-er position means higher salary, recognized personal ability, more social interaction, strong personal career achievement, communication and coordination with other department personnel in the management position, and strong interpersonal communication ability. Nurses with positions belong to management posts, and the focus of their work is to monitor the quality and safety of nursing, which plays a guiding and monitoring role. They do not engage in specific nursing work, and generally do not need to work on night shift. Therefore, the nurses with high positions are willing to delay retirement.

Summary
The most expected retirement age of nurses is 50 -55 years old, and they prefer to retire early. The influencing factors of nurses' willingness to postpone retirement include position and expected retirement age. Delayed retirement can better solve the pension problem, and delayed retirement can relieve child economic pressure, social opportunities and emotional fatigue. We should take into account the particularity of the nursing industry in order to postpone the retirement age of nurses. We should take effective measures according to the influencing factors and formulate a gradual retirement policy.

Fund Project
Innovation and entrepreneurship training program for college students of Hainan Medical College (hycx2015035). Hainan University Students' innovation and entrepreneurship training program (20160111).

Conflicts of Interest
The authors declare no conflicts of interest regarding the publication of this paper.