Table 1.

The changes in the socio-demographic factors of participants between the baseline and the last follow-up survey

Basic information	Classfication	LBS				NLBS
		The baseline survey (986)	The last follow-up survey (822)	χ 2	P	The baseline survey (336)	The last follow-up survey (279)	χ 2	P
Gender	Male	585	459	2.239	0.135	195	176	1.622	0.203
	Female	401	363			141	103
Grade	Junior grade one	488	451	5.185	0.023	159	144	1.123	0.289
	Senior grade one	498	371			177	135
Siblings	Yes	884	750	1.296	0.255	283	237	0.061	0.806
	No	102	72			53	42
Living situation	In school	664	506	6.571	0.010	198	156	0.567	0.451
	Out of school	322	316			138	123
Parents’ marital status	Divorced	71	61	0.032	0.858	17	18	0.55	0.458
	Not divorced	915	761			319	261
Economic status	Good	41	21	24.822	0.000	33	11	10.427	0.005
	Medium	720	681			240	226
	Bad	225	120			63	42

Abbreviations: LBS left-behind students, NLBS non-left-behind students