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Table 2 Correlation of refractive error between the right and left eyes

From: The increasing prevalence of myopia and high myopia among high school students in Fenghua city, eastern China: a 15-year population-based survey

Year Right Left P valuea Spearman r
Mean ± SD Median (IQR) Mean ± SD Median (IQR)
2001 −2.5 ± 2.0 − 3.0(− 4.0,-2.0) −2.4 ± 2.0 − 3.0(− 4.0,-2.0) 0.021 0.90
2002 − 2.7 ± 2.0 − 3.0(− 4.0,-2.0) − 2.6 ± 2.0 − 3.0(− 4.0,-2.0) 0.020 0.89
2003 − 2.8 ± 2.0 − 3.0(− 4.5,-2.0) −2.7 ± 2.0 − 3.0(− 4.0,-2.0) 0.011 0.89
2004 −2.8 ± 2.0 −3.0(− 4.0,-2.0) − 2.7 ± 2.0 −3.0(−4.0,-2.0) 0.006 0.90
2005 − 2.6 ± 2.1 −3.0(− 4.0,-2.0) − 2.5 ± 2.1 − 3.0(− 4.0,-2.0) 0.004 0.90
2006 − 2.7 ± 2.0 − 3.0(− 4.0,-2.0) −2.6 ± 2.0 −3.0(− 4.0,-2.0) 0.010 0.92
2007 −2.9 ± 2.0 −3.5(− 4.0,-2.0) − 2.8 ± 2.0 − 3.0(− 4.0,-2.0) 0.037 0.91
2008 − 3.0 ± 2.1 − 3.5(− 4.5,-2.0) −2.9 ± 2.1 −3.5(− 4.5,-2.0) 0.007 0.92
2009 −3.1 ± 2.2 −3.5(−5.0,-2.0) −3.0 ± 2.2 − 3.5(− 4.5,-2.0) 0.022 0.93
2010 −3.1 ± 2.2 − 3.5(−5.0,-2.25) −3.0 ± 2.2 − 3.5(− 4.5,-2.0) 0.012 0.90
2011 −3.2 ± 2.1 − 3.5(− 5.0,-2.5) −3.0 ± 2.2 − 3.5(− 4.75,-2.0) 0.011 0.92
2012 −3.2 ± 2.2 − 3.5(− 5.0,-2.5) −3.1 ± 2.2 − 3.5(− 5.0,-2.0) 0.007 0.93
2013 −3.2 ± 2.1 − 3.5(− 5.0,-2.5) −3.1 ± 2.2 − 3.5(− 5.0,-2.25) 0.010 0.91
2014 −3.3 ± 2.2 − 3.5(− 5.0,-2.5) −3.1 ± 2.2 − 3.5(− 5.0,-2.25) 0.006 0.91
2015 −3.4 ± 2.3 − 3.5(− 5.0, −1.75) −3.2 ± 2.3 − 3.25(− 5.0, − 1.5) 0.000 0.93
  1. RE refractive error, IQR interquartile range, a Mann Whitney test