Table 4.

Compare the score of dry eye symptoms between graft-versus-host disease (GVHD) and non-GVHD patients.

Serum vitamin A	Baseline (mean ± SD)	3 months	GVHD onset	1 month after liver GVHD	Paired difference (VS baseline)
					3 months	GVHD onset	Liver GVHD
GVHD	0.71 ± 0.25	0.69 ± 0.17	0.97 ± 0.30	0.18 ± 0.03	t = 0.378, P = 0.710	t = 2.553, P = 0.020	t = 6.076, P = 0.004
Non-GVHD	0.71 ± 0.26	0.74 ± 0.22			t = 1.22, P = 0.233

P, the results of each stage after treatment and before treatment were compared, respectively.