Table 1.

Demographic characteristics (n = 414).

Variables	n	(%)
Age
20–30	161	38.89
31–39	241	58.21
> 39	12	2.90
Nation
Han Chinese	358	86.47
Ethnic minorities	56	13.53
Working years
0–9	240	57.97
> 9	174	42.03
Professional title
Junior title	286	69.08
Intermediate title	121	29.23
Associate senior title	7	1.69
Education
College	77	18.60
Bachelor's degree	326	78.74
Master's degree	11	2.66
Number of births
First birth	353	85.27
Second birth	61	14.73