BMC Ophthalmology

Table 2 Refractive error (diopters; spherical equivalent) in participants in the Haidian District of Beijing, China

From: The increasing prevalence of myopia in junior high school students in the Haidian District of Beijing, China: a 10-year population-based survey

	Right eye				Left eye				Worse eye
Year	Mean	Median	SD^a	Min^b, Max^c	Mean	Median	SD^a	Min^b, Max^c	Mean	Median	SD^a	Min^b, Max^c
2006	−1.92	−1.50	2.26	−12.75, +8.50	−2.03	−1.50	2.32	−11.25, +7.25	−2.23	−1.75	2.42	−12.75, +8.50
2007	−1.97	−1.50	2.30	−13.00, +7.75	−2.15	−1.75	2.42	−13.25, +8.25	−2.30	−2.00	2.51	−13.25, +8.25
2008	−2.07	−1.75	2.26	−12.50, +8.25	−2.30	−2.00	2.43	−10.75, +7.75	−2.45	−2.25	2.47	−12.50, +8.25
2009	−2.25	−1.75	2.35	−11.00, +9.50	−2.46	−2.25	2.43	−12.50, +6.75	−2.59	−2.25	2.49	−12.50, +9.50
2010	−2.34	−2.00	2.43	−11.75, +10.25	−2.53	−2.25	2.54	−11.75, +8.25	−2.68	−2.50	2.60	−11.75, +10.25
2011	−2.42	−2.00	2.46	−12.00, +7.25	−2.62	−2.25	2.57	−12.75, +9.75	−2.76	−2.50	2.64	−12.75, +9.75
2012	−2.47	−2.00	2.45	−11.25, +8.75	−2.70	−2.50	2.58	−11.50, +10.75	−2.86	−2.50	2.63	−11.50, +10.75
2013	−2.54	−2.25	2.50	−12.50, +7.75	−2.78	−2.50	2.60	−13.00, +7.25	−2.93	−2.75	2.66	−13.00, +7.75
2014	−2.68	−2.50	2.46	−13.00, +9.25	−2.89	−2.75	2.55	−13.25, +8.25	−3.07	−2.75	2.61	−13.25, +9.25
2015	−2.75	−2.50	2.51	−12.75, +8.25	−2.95	−2.75	2.61	−12.75, +8.50	−3.13	−2.75	2.66	−12.75, +8.50
Total	−2.34	−2.00	2.42	−13.00, +10.25	−2.54	−2.25	2.52	−13.00, +10.75	−2.70	−2.50	2.59	−13.25, +10.75

^a SD = standard deviation; ^b Min = minimum; ^c Max = Maximum

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ISSN: 1471-2415

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