Table 2.

Descriptive analysis of categorical variables.

Variable	Group	Sample size (n)	Mean (M)	Standard deviation (SD)	t/F	p
Gender	Female	1,552	53.603	11.897	3.991	< 0.001
	Male	1853	51.950	12.158
Parents’ education level	Secondary School or below	862	52.304	12.592	1.784	0.168
	Bachelor’s Degree	2,101	53.005	11.831
	Master’s degree and above	442	52.048	12.102
Only child	Non-only child	2,174	52.039	11.952	−4.283	< 0.001
	Only child	1,231	53.877	12.181
Physical health status	Poor	558	52.667	12.548	0.972	0.378
	Average	1741	52.962	11.973
	Good	1,106	52.316	11.964
BMI category	Underweight	262	50.008	12.081	23.575	< 0.001
	Normal	2,156	51.939	12.074
	Overweight	457	53.847	11.688
	Obese	530	56.160	11.581
Family size	2 or fewer people	670	52.151	12.562	1.341	0.259
	3 people	1,241	53.060	12.045
	4 people	1,036	52.909	11.851
	5 or more people	458	52.079	11.848
Depressive symptoms	No depressive symptoms	2,128	49.779	11.713	−19.218	< 0.001
	Depressive symptoms present	1,277	57.576	11.030
Anxiety symptoms	Anxiety symptoms present	1965	55.581	11.575	16.926	< 0.001
	No anxiety symptoms	1,440	48.776	11.610

t statistics (independent-samples t-tests) were computed as the mean of the first-listed group minus the mean of the second-listed group; F statistics are from one-way ANOVA.