Lhasa childhood eye study: the rationale, methodology, and baseline data of a 5 year follow-up of school-based cohort study in the Tibetan plateau region of Southwest China

Table 2 Comparison of refractive status between LCES and ACES

Parameters	LCES			ACES			Statistic value	P
Parameters	n (%)	Median	Mean ± SD	n (%)	Median	Mean ± SD	Statistic value	P
Age, years	1856	6.78	6.83 ± 0.46	2893		7.1 ± 0.5	T = 18.73	p < 0.001^a
Cycloplegic SE	1853	+ 1.13D	+ 1.07 ± 0.92D	2749	+ 1.50D	+ 1.44 ± 1.05D	T = 12.78	p < 0.001^a
Hyperopia^c	128 (6.91)	+ 2.38	+ 2.78 ± 1.03	64 (2.3)				p < 0.001^b
Emmetropia	1652 (89.15)	+ 1.13	+ 1.05 ± 0.49	2003 (72.9)				p < 0.001^b
Myopia^c	73 (3.94)	−1.00	−1.53 ± 1.49	106 (3.9)				P = 0.886^b
High myopia^c	3 (0.16)	−6.25	−7.16 ± 1.59	2 (0.1)				P = 0.398^b

D diopter, SD standard deviation, LCES Lhasa Childhood Eye Study, ACES Anyang Childhood Eye Study
^aThe Independent-Samples T-test was used to compare the age and cycloplegic SE between LCES and ACES; ^bThe Bonferroni method was used to calibrate the test level for the pairwise comparisons of the refractive states; ^cHyperopia, myopia and high myopia were defined as spherical equivalent≥ + 2.00D, ≤ − 0.50D, and ≤ − 6.00D, respectively (based on data from the right eyes)

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