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Table 3 The ROP screening number from 2010 to 2012(n/%)

From: A systematic study on the prevention and treatment of retinopathy of prematurity in China

Organization level 2012 2011 2010
Tertiary medical institutions 30,547/87.1% 23,045/83.3% 16,125/79.7%
Secondary and below medical institutions 7799/12.9% 4630/16.7% 2382/20.3%
Sum 38,346 27,675 18,507
  1. χ2 = 499.5 P < 0.0001