Table 1.

General characteristics of the participants.

Variables	Men	Women	95% Confidence Interval	p
Sample size, n	100	101	---	0.994
Age, years	19.9 ± 2.0	20.4 ± 2.1	−0.07 to 1.06	0.090
Body mass index, Kg/m2	23.7 ± 4.1	22.3 ± 3.5	−2.8 to −0.6	0.002
Years of using smartphone	9.7 ± 2.7	9.6 ± 2.3	−0.8 to 0.5	0.706
Mini-mental state examination, pts	28.9 ± 1.1	28.8 ± 1.2	−0.4 to 0.2	0.516
Frontal assessment battery, pts	16.6 ± 0.9	16.6 ± 1.0	−0.2 to 0.2	0.932

Data are presented in number of events for categorical variables and mean ± standard deviation for continuous variables. p value of the chi-square test for the categorical variables and p value of the Student’s t-test for the continuous variables.