[Retracted] Design and Analysis of a Smart Sensor-Based Early Warning Intervention Network for School Sports Bullying among Left-Behind Children

Table 1

Crosstabulation analysis of grade levels and bullying periods in the time in which school bullying occurred.

Grade	Bullying time
	During school	In class	Between classes	After school
First day
Number	30	12	20	41
Proportion	29.13%	11.65%	19.42%	39.81%
Second grade
Number	23	10	12	35
Proportion	28.75%	12.50%	15.00%	43.75%
Third grade
Number	45	16	28	53
Proportion	31.69%	11.27%	19.72%	37.32%