Statistical Analysis:
In the study by Gunay et al., it was reported that the rate of smoking exposure among pediatric patients who visited the general outpatient clinic was approximately 55% 4. Assuming that this rate can be 75% in pediatric patients with cancer, it has been calculated a total of 196 participants , 98 in each group, to be included in the control and patient groups with 80% power and 0.05 error level, using G Power 3.1.9.2 package program.
The descriptive statistics were used to report the mean, standard deviation, median, minimum, and maximum values for the continuous data, number and percentage values for discrete data. The Shapiro-Wilk test was used to check for the normal distribution. T-test was used for comparing continuous data between case and control groups for normally distributed data, while Mann-Whitney U test was used for non-normally distributed data. Chi-square and Fisher’s exact tests were used for group comparisons (cross tables) of nominal variables. IBM SPSS Statistics 20 program was used and p < 0.05 was accepted as statistical significance limit.