2.5. Statistical Analysis Baseline characteristics were expressed as median and interquartile range (IQR)for continuous variables , and as total count and percentage for categorical variables. The proportional hazards assumption was tested by stratifying by examined variables. The plots of the estimated log-log survival curves were found to be approximately parallel and fulfilled the proportional hazards assumption Multivariable Cox proportional hazards regression analysis was used to calculate hazard ratios (HR)with 95% CI with mutual adjustment for the included risk factors Dietary components , total energy intake, age and BMI were tested for normal distribution with the Kolmogorov -Smirnov test. All these variables were log transformed due to skewed distribution and HRs were expressed per 1 standard deviation (SD) increment. For statistical analyses IBM SPSS Statistics, version 26 (SPSS, Chicago, IL, US A) was used, and level of statistical significance was plt 0.05 3. Results 3.1.Baseline Characteristics

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2.5. Statistical Analysis Baseline characteristics were expressed as median and interquartile range (IQR)for continuous variables , and as total count and percentage for categorical variables. The proportional hazards assumption was tested by stratifying by examined variables. The plots of the estimated log-log survival curves were found to be approximately parallel and fulfilled the proportional hazards assumption Multivariable Cox proportional hazards regression analysis was used to calculate hazard ratios (HR)with 95% CI with mutual adjustment for the included risk factors Dietary components , total energy intake, age and BMI were tested for normal distribution with the Kolmogorov -Smirnov test. All these variables were log transformed due to skewed distribution and HRs were expressed per 1 standard deviation (SD) increment. For statistical analyses IBM SPSS Statistics, version 26 (SPSS, Chicago, IL, US A) was used, and level of statistical significance was plt 0.05 3. Results 3.1.Baseline Characteristics

Answer 1

The baseline characteristics of the study population are presented in the form of median and interquartile range (IQR) for continuous variables, and total count and percentage for categorical variables. The proportional hazards assumption was tested by stratifying by examined variables, and the plots of the estimated log-log survival curves were found to be approximately parallel, indicating that the assumption was fulfilled. Multivariable Cox proportional hazards regression analysis was used to calculate hazard ratios (HR) with 95% confidence intervals (CI) with mutual adjustment for the included risk factors. Dietary components, total energy intake, age, and BMI were tested for normal distribution with the Kolmogorov-Smirnov test. All these variables were log transformed due to skewed distribution, and HRs were expressed per 1 standard deviation (SD) increment. The statistical analyses were conducted using IBM SPSS Statistics, version 26, and the level of statistical significance was set at p < 0.05.

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