Data analysis
After completion of the investigation, the integrity and authenticity of the data were checked on the spot, the unqualified questionnaire (missing items, answers appeared in a certain pattern, two or more options were selected) was screened, and 50% of the collected questionnaires were randomly selected to verify the authenticity of the indicators. Data is checked and entered by two people on two machines. SPSS for Windows (Ver.20.0 IBM, New York, USA) were used to analyze the data. The demographic and clinical data of the parents and the children were presented as means with standard deviations (SDs), frequency or composition ratio. T test and chi-square test were performed to examine the differences between gender and among different age groups. Pearson’s Chi-square test was used to compare the prevalence of PTSS in parents and children. Independent-sample t test was used to compare the total score of PCL-C, PTSDI, depression, and family functioning. Pearson correlation coefficient was calculated to measure the correlations among the total PCL-C score, depression, family functioning, PTSDI score and VAS score. Independent-sample t test and one-way analysis of variance (ANOVA) were used to examine differences in PTSDI scores among children with cancer with different disease experiences. A P value less than 0.05 was considered to indicate a statistical significance.