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Statistical analysis

FJ Farzad Jalali
FH Farbod Hatami
MS Mehrdad Saravi
IJ Iraj Jafaripour
MH Mohammad Taghi Hedayati
KA Kamyar Amin
RP Roghayeh Pourkia
SA Saeid Abroutan
MJ Mostafa Javanian
SE Soheil Ebrahimpour
NV Niloufar Valizadeh
SB Saeede Khosravi Bizhaem
NZ Naghmeh Ziaie
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Continuous variables are presented as mean ± standard deviation (SD), while the categorical data are presented as numbers and percentages. We used the χ2 and fisher’s exact tests for comparison between categorical variables in each group. A Cox regression analysis was utilized to determine the independent impact of each of the variables for predicting primary outcome of interest. Survival curves were analyzed through the Kaplan-Meier method. A two-sided P-value of less than 0.05 was considered to be statistically significant. Statistical analyses were performed using SPSS version 22.0 software (SPSS, Inc., Chicago, IL, USA).

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