BMC Ophthalmology

Table 2 Comparison of uncorrected visual acuity (LogMAR notation) between groups

From: Effect of outdoor activity on myopia onset and progression in school-aged children in northeast china: the sujiatun eye care study

	Intervention group			Control group			P Value^*
	T1^a	T2^a	T3^a	T1^a	T2^a	T3^a	P Value^*
Rural (n = 1539)	0.11 ± 0.20	0.15 ± 0.23	0.15 ± 0.24	0.11 ± 0.20	0.16 ± 0.23	0.18 ± 0.24	< 0.001
Urban (n = 1512)	0.12 ± 0.21	0.16 ± 0.23	0.16 ± 0.23	0.12 ± 0.24	0.17 ± 0.27	0.19 ± 0.29	< 0.001
Elementary school (n = 2451)	0.09 ± 0.18	0.12 ± 0.21	0.13 ± 0.22	0.08 ± 0.18	0.12 ± 0.22	0.14 ± 0.22	< 0.001
Secondary school (n = 600)	0.23 ± 0.26	0.29 ± 0.28	0.27 ± 0.28	0.26 ± 0.29	0.32 ± 0.30	0.36 ± 0.34	< 0.001
Suspected myopia (n = 997)	0.34 ± 0.20	0.39 ± 0.24	0.39 ± 0.24	0.36 ± 0.24	0.44 ± 0.27	0.48 ± 0.29	< 0.001
Non-suspected myopia (n = 2054)	0.005 ± 0.05	0.03 ± 0.09	0.03 ± 0.09	0.004 ± 0.04	0.039 ± 0.09	0.06 ± 0.10	< 0.001
Combined (n = 3051)	0.12 ± 0.20	0.15 ± 0.23	0.16 ± 0.24	0.12 ± 0.22	0.16 ± 0.25	0.19 ± 0.27	< 0.001

T1 means baseline; T2 means after 6 months; T3 means after 12 months
^aData are expressed as the mean ± SD
^*Multivariate analysis of variance for repeated measures between groups

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