Cancer continues to be an enormous public health issue because of a growing and aging population and an increasing prevalence of unwholesome lifestyles. In 2012, there were approximately 14.1 million new cancer cases and 8.2 million cancer-related deaths worldwide, a huge burden both in developed and developing countries.1 Based on the national estimates of cancer in China, cancer incidence and mortality are increasing, making cancer the leading cause of death since 2010 and a major public health problem.2 Almost 22% of global new cancer cases and close to 27% of global cancer deaths occur in China.3 Self-management (SM) could be viewed as a model that enables patients and families to achieve their own goals of care.4 Self-management is described as those tasks that individuals undertake to deal with the medical, role, and emotional management of their health condition to monitor and manage disease symptoms and minimize the influence of illness on social function, emotional health, and interpersonal interaction, to gain a sense of control over their lives and enjoy a better quality of life.5,6 Studies have described positive effects of SM interventions on improving functional status, health service utilization, and overall quality of life among cancer patients.7–9 Self-management behavior in cancer patients varies because of different personal characteristics and disease adaptation levels. Factors, including physical and socioeconomic status, such as self-efficacy, social support, and coping style are important factors associated with SM behaviors of cancer survivors.
Self-efficacy is a psychological concept derived from Bandura's social cognitive theory10 and is defined as “the conviction that one can successfully execute the relevant self-care behaviors in particular situation.”11 Self-efficacy has been identified as a powerful mediator of health-promoting behaviors. Previous studies showed that patients with higher self-efficacy are more likely to engage in effective strategies and demonstrate greater persistence in trying to achieve desired psychosocial and medical outcomes.12 Self-management can be seen as a broad set of strategies developed to enable people to cope effectively and reduce the long-term impact of the illness. It is characterized by informed, activated patients collaborating with proactive health providers.13
Some research reports confirmed the relationship between self-efficacy and SM behavior. Liang et al14 identified a positive link between self-efficacy and opioid adherence and offered some insights into the complex issues associated with patient SM of pain medication. The results of Curtin and colleagues'15 study on chronic kidney disease showed that higher perceived self-efficacy scores were significantly associated with increased communication, partnership, self-care, and medication adherence behaviors. Sarkar et al16 reported that self-efficacy was associated with SM behaviors in patients with diabetes, across both race/ethnicity and health literacy levels. In Lila's study, higher levels of self-efficacy were associated with more positive patient-centered communication.17 In summary, although the relationship between self-efficacy and SM behavior was documented in multiple chronic diseases, there is limited research focusing on these constructs in cancer survivors in a Chinese population. Therefore, the magnitude of the associations between self-efficacy and SM behaviors deserves studying among patients with cancer in China.
Social support has a positive effect on health promotion behaviors in patients with cancer, thus resulting to a better health status. Social support is a major factor positively affecting patients' self-efficacy and SM behavior. Collie and colleagues18 demonstrated that breast cancer patients who had higher social support for coping with stresses reported fewer difficulties in medical interactions. Schiøtz et al19 reported social support to be significantly associated with health-promoting behaviors and well-being among patients with type 2 diabetes. According to Lee and Wang,20 social support was positively correlated with self-care behaviors in hemodialysis patients. Amir et al21 emphasized that the quality of life of patients with epilepsy could be improved by reinforcing their self-efficacy and that social support was a mediator between disease severity and self-efficacy.
Coping style is a person's characteristic strategies used in response to life situations. Coping is a dynamic process and consists of cognitive and behavioral effects to manage specific demands that are exceeding the resources of the person. Coping has 2 functions: (1) emotion focused (aiming at ameliorating the negative emotions associated with the stressor) and (2) problem focused (implying efforts to practically manage the cause of the stressor).22 In coping with the threat of cancer, 2 important styles have been distinguished. The first concerns the degree to which an individual cognitively confronts herself/himself with the upcoming threat, and the second pertains to the degree to which an individual makes use of cognitive avoidance.23,24 The process of coping with emotional and physical demands involves developing strategies for dealing with either immediate or possible problems and applying methods to handle the negative emotions that accompany the problem.25,26 Zuuren and Dooper's study23 demonstrated that coping style was significantly, although modestly, related to health promotion behaviors. Although in Mohamed's27 research, coping style (active coping, accommodation, and avoidance coping) was identified as having a mediating role with self-efficacy and social support in patients with cancer, it is far from clear how psychological coping style affects SM behaviors in patients with cancer.
From the previously mentioned findings, it is clear that self-efficacy, social support, and coping strategies are the 3 major variables affecting SM behaviors in patients with cancer. However, previous studies tend to consider the simple associative relationship between 2 variables or studied the variables as a single item instead of one with multiple dimensions.21,28 Because there is a lack of research investigating in detail interrelationships among different domains of the 3 major variables, we analyzed these variables in a large sample of Chinese adults to address this issue. A systematic review revealed additional health behavior measures, such as physical exercises, communication with their physicians, and adherence to doctors' recommendations.29 In this study, we focus on three of these specific measures of SM behaviors: communication with physicians, exercises activities, and information seeking.
The theoretical framework of this study is derived from Behaviour Change Wheel.30 This framework wheel was composed of a 3-layer ring structure covering 7 policy categories, 9 intervention functions, and 3 essential conditions from outer to inside. The hub of this framework is a behavior system called COM-B, involving capability, opportunity, and motivation that interact to generate behavior that in turn influences these components. Capability is defined as the individual's skills to engage in the activity of focus. Coping style is related to the concept of capability based on cancer patients' knowledge and technical self-care. Motivation is defined as brain processes that energize and direct behavior. The core concept of a person's self-efficacy is the self-confidence to do something to promote SM behaviors, referring to communication, exercise, and information seeking in this study. Opportunity is defined as all the factors that lie outside the individual that make the behavior possible or prompt it. Social support from patients' families and the society prompts a more active behavior. Guided by the COM-B and previous research findings, we sought to examine how self-efficacy, social support, and coping style affected specific SM behaviors among Chinese adult cancer patients.
Study Design and Participant
We did a secondary data analysis in this study from a cross-sectional survey with a convenience sample of 764 cancer patients recruited from 6 oncology and general hospitals in Shanghai, Shandong, and Jiangsu Provinces of China during the period of February to October 2010. Sample size is determined by the minimum numbers needed to conduct structural equation modeling (SEM).31 Approval of the study was received from the ethics committee of the Second Military Medical University (approval file number 2010LL008). Patients were included if they were (1) diagnosed with cancer, (2) 18 years or older, (3) willing to be interviewed, (4) at least 6 months after the diagnosis of cancer, and (5) informed of their cancer diagnosis. Patients were excluded if they had a diagnosed mental disorder or cognitive impairment. Detailed information on recruitment approaches, eligibility criteria, ethical review, and data collection procedures are available in a previously reported study.32
Demographic and Disease-Related Measures
Demographic data collected included age, gender, marital status, education, lifestyle, and employment status. The type of cancer was also collected.
Self-efficacy was assessed using the Chinese version of the Strategies Used by People to Promote Health (C-SUPPH). The original scale, developed by Lev and Owen,33 is a 29-item self-report measure of confidence in performing self-care strategies among patients with cancer and includes 3 subscales: positive attitude (16 items), stress reduction (10 items), and making decisions (3 items); a 5-point Likert scale is used, ranging from 1 (not at all confident) to 5 (highly confident). Higher scores indicate higher self-efficacy. The 3 subscales have good internal consistency, with coefficient α values of .92, .89, and .83, respectively.34 The C-SUPPH contains 28 items (2 items with similar Chinese meaning combined into one) and the same 3 subscales, with Cronbach's α coefficients ranging from .849 to .970.35
Social support was measured by the Social Support Rating Scale (SSRS), which was developed by Chinese scholar Xiao from the Mental Health Institution of the Hunan Medical University in 1986 and revised in 1994.36 The 10-item scale measures 3 factors: objective support (3 items), subjective support (4 items), and use of support (3 items). Items 1 to 4 and 8 to 10 are rated on a 4-point Likert scale from 1 to 4, with 1 corresponding to the least amount of support and 4 corresponding to the greatest amount of support. Items 5 to 7 are measured on assigned actual numbers (eg, “take the initiative to participate and be active” is equal to 4 points). Therefore, the higher the scores, the higher is the degree of social support. A total score less than 33 represents low social support, a score of 33 to 45 represents moderate social support level, and a score greater than 45 represents high social support. The scale and 3 subscales are internally consistent, with Cronbach's αs ranging from .89 to .94.37
Coping style was self-assessed using the Brief Coping Orientation to Problems Experienced Scale developed by Carver.38 This tool covers 14 distinct coping strategies as potential responses to stressors, such as acceptance, positive reinterpretation, use of humor, denial, behavior disengagement, and avoidance strategies,39 and the Guttman coefficient was 0.86.40 We used 3 items responding to the cancer patients' coping strategies (confrontation, avoidance, and giving up)41 and a dichotomous variable (1, face positively; 0, avoid or give up) for the study.
COMMUNICATION WITH PHYSICIANS
Communication with physicians was measured using the Communication with Physicians Scale (CPS). The Communication with Physicians Scale was developed by Lorig et al.42 The 3 items of the scale were measured by asking the following questions when a participant visited his/her doctor: how often do you do the following: (1) prepare a list of questions for your doctor, (2) ask questions about the things you want to know and things you do not understand about your treatment, and (3) discuss any personal problems that may be related to your illness. A higher score indicates better communication with physicians. The Cronbach's α was .73. The Chinese version of the scale has been evaluated in the Chronic Disease Self-Management Program in Shanghai by Fu et al.43 This scale was used to determine whether the behaviors regarding communication with healthcare providers varied among patients with different levels of self-efficacy and social support. In the current study, a 3-level ordinal measure was generated based on the composite score of the 3 items: 1, poor (score < 6); 2, medium (6 ≤ score ≤ 10); and 3, good (10 < score ≤ 15).
Exercise activities were measured based on patients' responses to the following questions: (1) “Do you usually exercise (yes vs no)?” and (2) “How often do you exercise?”, in which a 4-level ordinal measure of exercise was generated: 1, never; 2, less than once a week; 3, 1 to 3 times a week; and 4, more than 3 times a week.
Information-seeking behavior was measured by checking whether a patient ever attended the health education lecture or not (1, yes; 0, no).
Structural equation modeling was used to test the hypothesis. All analyses were completed using the Mplus 7.0. Both self-efficacy and social-support are treated as second-order factors/latent variables. The first-order factors of stress reduction, decision-making, positive attitude, subjective and objective social support, and use of social support were treated as indicators of the latent variables, respectively. Self-management behaviors (ie, communication, exercise, information seeking) and coping are either ordinal or binary measures (see Measures section); the data were not normally distributed, so they were recoded accordingly, and the robust weighted least squares estimator was used for model estimation by default in Mplus.44 As such, the path coefficients linked to those endogenous variables are all Probit slope coefficients, representing the effects of predictors on the latent continuous variables of the observed ordinal and binary endogenous variables. Statistical significance was set as P < .05.
Half of the sample was women (50.8%). The mean (SD) age of participants was 54.0 (15.1) years (median, 54.0 years). Approximately 48.3% of the sample had less than a high school education, 33.9% completed high school, and 17.8% had a college degree. Patients diagnosed with stomach or colorectal cancer accounted for approximately one-third of the sample (34.4%), and the remainder were diagnosed with lung cancer (20.3%), gynecological cancer (29.7%), and other cancers (15.6%), respectively (Table 1). Approximately 21.5% of the sample could not confront their disease status. Only 32.1% of the participants reported good communication with their physicians, and a very small portion of the sample (12.8%) reported doing physical exercise 3 times or more per week. In regard to information seeking, less than one-third of the participants (31.8%) reported information seeking (Table 2).
Table 3 shows the descriptive statistics of self-efficacy (C-SUPPH) by item and subscale. The reliabilities of the subscales (stress reduction, decision-making, and positive attitude) were estimated by Cronbach's α, ranging from .83 to .97, and the reliability for the overall C-SUPPH scale was 0.98. The corresponding figures for the subscale and scales of social support (SSRS) are shown in Table 4. The Cronbach's αs were .55 for use of social support, .64 for objective social support, and .68 for subjective social support. However, the α for the overall SSRS was .75. The Cronbach's αs of all the 3 subscales of SSRS were smaller than the cutoff point of .70, indicating large measurement errors in the scale item responses. Fortunately, measurement errors can be readily handled in SEM.
Based on model fit indices, 1 error covariance in the self-efficacy measurement model and 3 error covariances in the social support measurement model are specified as free parameters (Figure). The effects of the 2 second-order factors on SM behaviors (ie, communication, exercise, and information seeking) are tested with coping as a mediating variable. The SEM fits the data: root mean square error of approximation (RMSEA) of 0.034 (90% confidence interval, 0.031–0.036), close-fit test cannot reject the hypothesis of RMSEA of 0.05 or less (P > .05), comparative fit index of 0.91, Tucker-Lewis index of 0.90, and weighted root mean square residual of 0.82. For both self-efficacy (C-SUPPH) and social support (SSRS), all items highly loaded to their underlying first-order factors, and the first-order factors highly loaded to their underlying second-order factors (see the top panel of Table 5). The path coefficient estimates of the SEM are shown in the bottom panel of Table 5. Coping style has a significant positive effect on both communication (0.272, P < .001) and information seeking (0.183, P = .004) but no significant effect on exercise (−0.075, P = .146). Self-efficacy had significant positive effects on coping (0.262, P < .001) and exercise (0.193, P < .001). It also significantly influenced communication indirectly via coping (0.071, P = .003) (Table 5). Social support had a positive direct effect on both communication (0.345, P < .001) and exercise (0.302, P < .001), but its direct effect on information seeking was only marginal (0.133, P = .069). Social support also affected SM behaviors significantly via various indirect paths: positive indirect effect on exercise via self-efficacy (0.105, P < .001), positive indirect effect on communication (0.039, P = .003) via self-efficacy and coping, and positive indirect effect on information seeking (0.026, P = .024) via self-efficacy and coping. The total indirect effect and total effect of social support were positive and statistically significant on all the 3 SM behaviors (see the bottom panel of Table 5). In addition, social support also significantly affected coping style via self-efficacy (0.142, P < .001).
Self-efficacy had a significant positive effect on coping style (0.262, P < .001). In regard to its effects on the SM behaviors, it directly affected exercise (0.193, P < .001) but indirectly affected communication (0.071, P = .003) and information seeking (0.048, P = .023) via coping style.
In our study, most participants reported a positive response pattern toward cancer, although their SM behaviors involving exercise and communication with doctors need to be improved. The number of participants in this study who initiated seeking health education lecture was less than 40%. It was possible that they preferred to seek information in Web sites or on the Internet or just ask doctors or nurses directly. All these indicate a need for an intervention for improving patients' knowledge about treatment and self-care skills. In addition, the SEM results on SM behaviors verified the relationship between self-efficacy and self-care behavior in a Chinese cancer sample, and the results are also clear about the associations within the 2 second-order factors (social support and self-efficacy) via the mediating variable of coping style. This model assists us in understanding SM behaviors in adult Chinese cancer patients. The relationship framework based on our SEM findings serves as a guide and supplement to previous research about the relationships among self-efficacy, social support, coping, and SM.
Our findings are similar to previous studies involving different ethnic groups. Beckham et al45 examined the relationship between self-efficacy and psychological adjustment in American cancer patients and that the patients with higher self-efficacy had better psychological adjustment than those with lower self-efficacy. Self-efficacy has been identified as a significant predictor of an active adjustment style and emotional well-being in patients with cancer in recent studies.46,47 Our findings show that self-efficacy has a significant direct positive effect on an important SM behavior—exercise. Such a positive correlation between self-efficacy and exercise behaviors has also been confirmed in diabetes,48 dementia,49 and heart disease50 patients in Asia, Europe, and the United States. In summary, self-efficacy should be an important therapeutic target for clinical interventions to improve exercise behaviors among patients with cancer. There are programs that can be adopted to help patients achieve successful performance and desired behaviors through improving their self-efficacy.5
The SEM results demonstrated that social support directly affected 2 SM behaviors (communication, 0.345, P < .001; and exercise, 0.302, P < .001). This finding was similar to studies conducted by Kamimura et al51 and Chair et al,52 where social support was an important factor in increasing exercise motivation among female free clinic patients and exercise efficacy among coronary artery disease patients. There is extensive research recognizing the importance of involving caregivers, spouses, or partners in educational and psychosocial interventions.53 In supporting the effects of communication, Bartlett et al54 found that good communication skills on the part of the physician played a positive effect on patients' satisfaction, recall, and adherence. Furthermore, Han et al55 documented that breast cancer patients who received less social support from spouses, other family members, and friends were more likely to feel dissatisfied with their medical team and experience more interaction problems. These findings suggest the need to expand support sources through different strategies that promote patient communication with physicians or families, as well as engaging in exercises. We also conclude that good social support significantly and positively affects communication, information seeking, coping style, and exercise via self-efficacy. To better promote healthy behaviors, we need to enhance patients' self-efficacy and provide social support. Our results also show that the effects of social support on coping were positive and statistically significant. The complicated effect of social support on SM behaviors via coping style and self-efficacy is depicted in the theoretical framework of Behaviour Change Wheel, indicating that opportunities can influence capability and motivation. Therefore, we can conclude that social support plays a vital role in promoting better SM behaviors.
Previous research on coping with cancer indicates that perceptions of control and active coping styles are associated with a more positive adjustment to cancer.56 Some studies suggest that SM behaviors and self-care abilities tend to be positive coping styles.57,58 The results of our study found that coping style significantly and positively affected communication and information seeking, although it did not affect exercise. Patients using confrontation coping style were more likely to communicate with the physician and seek disease-related information. This finding is similar to that of Collie and colleagues,18 who reported that breast cancer women in rural communities who scored higher on the self-distraction subscale of the coping measure were less likely to report difficulties interacting with their healthcare providers. It seems that patients who actually seek information, distract self, or use other such strategies may have less difficulty in communicating or interacting with healthcare professionals. Our results demonstrated that self-efficacy had a significant indirect positive effect via coping on both communication and information seeking. Although coping style as a mediating factor was tested in our study, we would argue that improving coping style without improving self-efficacy is not sufficient to improve communication or self-care. Maliski et al59 reported that prostate cancer patients with lower self-efficacy may have had lower confidence in their ability to communicate their concerns, ask questions, or express expectations for treatment, perhaps leading to diminished satisfaction. Of note, Mohamed27 examined the effect of coping style on self-efficacy and personal growth among cancer patients and found that direct effects of self-efficacy on personal growth were not significant when active coping was specified as a mediator between self-efficacy and personal growth. The mechanism of the interaction between self-efficacy and coping style in adjustment to cancer is by no means clear, and further investigations need to be conducted to provide evidence to clarify this interaction.
Our findings may help nurses to further improve their care of cancer survivors in terms of their SM behaviors, specifically communication, exercise, and information seeking. Future nursing interventions for promoting SM behaviors among cancer patients could be considered based on a comprehensive framework, including elements of self-efficacy, social support, and coping style.
Structural equation modeling provided a more comprehensive view of the relationships of variables of social support, self-efficacy, and coping style with SM behaviors. However, our study was a cross-sectional investigation, limiting our ability to determine the causal pathways to illustrate the cause and effect among these variables.
Recommendations for Future Research
The process of Chinese cancer patents' coping with disease seems to be complicated. In this study, we enhanced our understanding of the effect of positive or negative coping style on social support, SM behaviors, and self-efficacy. Future research should focus on examining the coping mechanism directly.
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Keywords:Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved
Cancer survivors; Coping style; Self-efficacy; Self-management behavior; Social support