Search results
Initially, a total of 337 publications were identified from the 12 databases. Then, 101 duplicate records were excluded by automation tools and 24 duplicate records were excluded by a human. 212 records were screened based on title and abstract. 87 studies were sought for retrieval and 82 reports were assessed for eligibility. Following full texts screening, 59 studies were excluded. Finally, 23 studies met the eligibility criteria, of which 16 studies were included in the meta-analysis. We searched studies via other methods, but did not find any additional studies that met the inclusion criteria. The flowchart details the literature selection process using the PRISMA 2020 flow diagram [18] (Fig. 1).
Study characteristics
The characteristics of the included studies are shown in Table 1. A total of 23 RCTs involving 2,002 women with stage I-Ⅳ breast cancer met the eligibility criteria and 16 of them were included in the meta-analysis. Data accrue mainly from China (n = 20), Taiwan (n = 1), United States of America (n = 1) and Spain (n = 1). The publication date of the included studies ranges from 2011 to 2020. The intervention time lasted from 1 week to 6 months. The 25-item Connor-Davidson Resilience Scale (CD-RISC-25) was the primary outcome measurement for most studies (n = 20) [25-44], and there were only 3 studies [45-47] used the Resilience Scale for Adults (RSA). Further details of the studies’ interventions were summarized in Table 2. The 16 studies for meta-analysis were divided into three groups: resilience training program (n = 8) [25-28, 38, 43, 45, 46], health education delivered via mobile devices (n = 5) [34, 36, 37, 42, 44] and peer support (n = 3) [31-33] based on the intervention measures. For the remaining 7 studies [29, 30, 35, 39-41, 47] that cannot be classified or meta-analyzed, we presented in a narrative form only.
Risk of bias assessment
Summary of quality assessments of all included RCT studies is shown in Fig. 2. With regard to the judgement of all the domains and signalling questions, twelve studies (78.3%) were judged to have low risk of bias, four studies (21.7%) were judged to raise some concerns, and none (0%) were judged to have high risk of bias for their outcomes. In general, the quality of the included studies was from moderate to high quality.
Synthesis of results
Resilience training program
Eight studies [25-28, 38, 43, 45, 46], with a total of 649 breast cancer women, reported data on the resilience training program. There was substantial heterogeneity among the studies (χ2 = 65.83, p = 0.000, I2 = 89.4%) according to the heterogeneity test. Therefore, we performed sensitivity analysis and found that Zhou K’s study [26] substantially influence the results. The heterogeneity has decreased significantly (χ2 = 19.25, p = 0.004, I2 = 69%) after removing the study. Therefore, the random effects model was utilized for the meta-analysis. The results showed that the resilience training program intervention was more effective than routine nursing care intervention in improving the resilience of breast cancer patients (SMD = 0.89; 95% CI 0.54, 1.24; p < 0.00001) (Fig. 3a).
Health education delivered via mobile devices
Five studies [34, 36, 37, 42, 44] provided information on the intervention of health education delivered via a mobile device, and these studies included 495 breast cancer women. There was substantial heterogeneity (χ2 = 80.74, p < 0.00001, I2 = 95%) according to the results of the heterogeneity test for these studies. Therefore, we used the random effects model to analyze these data, which confirmed that the intervention of health education delivered via a mobile device was more effective than routine nursing care in improving the resilience of breast cancer patients (SMD = 1.84; 95% CI 0.86, 2.82; p = 0.0002) (Fig. 3b).
Peer support
Three studies [31-33], with a total of 240 breast cancer women, reported data on the peer support. The results showed that the heterogeneity between the two groups was very significant (χ2 = 127.50, p < 0.00001, I2 = 98%), and we utilized a random effects model for the meta-analysis. The results showed that peer support was more effective than routine nursing care in improving the resilience of breast cancer patients (SMD = 2.62; 95% CI 0.61, 4.63; p = 0.01) (Fig. 3c).
Other kind of interventions
Seven studies [29, 30, 35, 39-41, 47], with a total of 617 breast cancer women, reported seven other kind of interventions which may contribute to improve resilience: 1) trinity nursing intervention, 2) nursing of family affection and psychological counseling, 3) synchronous stage cognitive therapy of family members combined with psychological intervention, 4) supportive psychological nursing, 5) psychological phased change nursing intervention, 6) admission and commitment therapy, and 7) collaboration care model. However, meta-analysis was abandoned and the evidence was presented in a narrative form because there was significant heterogeneity within the implemented interventions and the data cannot be classified and integrated. Further details about the summary of all the included studies’ interventions of all the included studies are shown in Table 2.
Subgroup analysis
Two subgroup analyses were undertaken based on the intervention time of resilience training program. The p-value for interaction was 0.85, which suggests that there was no interaction, in other words, the intervention time was not a source of heterogeneity. The results for the intervention times showed that the difference was not significant among the three subgroups: the intervention time was less than 12 weeks (SMD = 1.00; 95%CI 0.26, 1.74), the intervention time was 12 weeks (SMD = 1.19; 95%CI 0.10, 2.28), and the intervention time was more than 12 weeks (SMD = 0.88; 95%CI 0.57, 1.19). Overall, the results of the subgroup analysis showed that the resilience training program was more effective than the routine nursing care intervention, indicating the results of resilience training program had no change (Fig. 4).
Publication bias
We used Egger's linear regression test to detect the publication bias caused by the influencing factors quantitatively. The results for the resilience training program (95% CI -11.37, 9.41; p = 0.825) and the intervention of health education delivered via a mobile device (95% CI -10.38, 33.46; p = 0.192) showed that there was no significant publication bias among the included studies. However, the p-value for peer support (95% CI 3.81, 29.78; p = 0.039) was less than 0.05 and the results reversed significantly after the data were analysed by the trim and fill method, which indicated that there was significant publication bias.