Table 5.

The difference between AL change of different period

Group	Period	N	Mean difference ± SD, mm	Normality test	p
ALL	b-d	171	-0.0183 ± 0.133	0.000 < 0.05	0.041 < 0.05
	d-a	194	-0.004 ± 0.124	0.000 < 0.05	0.997 > 0.05
	b-a	107	-0.029 ± 0.135	0.000 < 0.05	0.137 > 0.05
Low age	b-d	92	-0.011 ± 0.113	0.310 > 0.05	0.355 > 0.05
	d-a	95	-0.003 ± 0.116	0.384 > 0.05	0.801 > 0.05
	b-a	48	0.006 ± 0.096	0.012 < 0.05	0.693 > 0.05
High age	b-d	79	-0.027 ± 0.153	0.000 < 0.05	0.033 < 0.05
	d-a	99	-0.005 ± 0.131	0.000 < 0.05	0.789 > 0.05
	b-a	59	-0.058 ± 0.155	0.000 < 0.05	0.023 < 0.05
Low myopia	b-d	93	-0.012 ± 0.115	0.206 > 0.05	0.325 > 0.05
	d-a	92	-0.018 ± 0.142	0.000 < 0.05	0.557 > 0.05
	b-a	54	-0.028 ± 0.145	0.000 < 0.05	0.496 > 0.05
Moderate myopia	b-d	78	-0.026 ± 0.152	0.000 < 0.05	0.035 < 0.05
	d-a	102	0.008 ± 0.104	0.104 > 0.05	0.424 > 0.05
	b-a	53	-0.031 ± 0.126	0.000 < 0.05	0.127 > 0.05
Male	b-d	64	-0.027 ± 0.108	0.092 > 0.05	0.050 > 0.05
	d-a	73	-0.012 ± 0.105	0.001 < 0.05	0.704 > 0.05
	b-a	35	-0.031 ± 0.096	0.002 < 0.05	0.154 > 0.05
Female	b-d	107	-0.015 ± 0.146	0.000 < 0.05	0.177 > 0.05
	d-a	121	0.000 ± 0.134	0.000 < 0.05	0.744 > 0.05
	b-a	72	-0.029 ± 0.151	0.000 < 0.05	0.349 > 0.05

^*Normality test > 0.05, using paired t-test; Normality test < 0.05, using Wilcoxon signed rank test