Statistical analysis:
Descriptive statistics were used for analysing demographic, treatment and disease characteristics. Quantitative variables are presented as its mean (SD) and qualitative variables as frequency (%). Pulmonary function test was classified as dichotomous variables-normal and abnormal. The prevalence of pulmonary function abnormalities is presented as frequency (%). The associated factors were also classified as dichotomous variables. Age at evaluation, age at start of chemotherapy and age at start of radiotherapy as ≤ 10 years and >10years.Cumulative bleomycin dose was categorised as ≤80mg/m2 (1mg=1IU) and >80mg/m2. The associations of categorical variables with abnormal pulmonary function was assessed using chi-square/ Fisher’s exact test. A p-value less than 0.05 was considered as statistically significant. Regression analysis and multivariable analysis couldn’t be carried out due to less event rate in our study sample. Analysis was done by stata14.