Prior to anthropometric measurements, 62 men and 63 women responded to an online questionnaire, including body weight (kilogram, kg) and height (centimeters, cm), and self-classified weight group ("I think I am … underweight, normal weight, overweight, obese"). 
online questionnaire
We used the following statistical analysis: Paired sample t-tests, a Bland-Altman plot kappa statistics, chi-squared tests, and a logistic regression.



Paired sample t-tests
We used the following statistical analysis: Paired sample t-tests, a Bland-Altman plot kappa statistics, chi-squared tests, and a logistic regression.


 Mean difference of BMI calculated from self-reported and measured data was 0.06 (95% CI -0.29 to 0.17, p = 0.593) in men, and 0.16 (95% CI -0.40 to 0.09, p = 0.224) in women, with four participants being outliers of the 95% limits of agreement (Bland-Altman plot). 
Bland-Altman plot
We used the following statistical analysis: Paired sample t-tests, a Bland-Altman plot kappa statistics, chi-squared tests, and a logistic regression.



kappa statistics
We used the following statistical analysis: Paired sample t-tests, a Bland-Altman plot kappa statistics, chi-squared tests, and a logistic regression.



chi-squared tests
We used the following statistical analysis: Paired sample t-tests, a Bland-Altman plot kappa statistics, chi-squared tests, and a logistic regression.



logistic regression