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Table 2 Identified zone at the time of diagnosis according to categories of severity of ROP

From: Incidence of retinopathy of prematurity type 1 and type 2 in a regional Hospital of Social Security in the state of Queretaro, Mexico (2017–2018)

  ZONE  
I II III TOTAL
n % n % n % n
non RT 1 5 6.0% 41 48.8% 38 45.2% 84
Immature Retina 1 2.1% 16 33.3% 31 64.6% 48
Mild ROP 0 0.0% 22 75.9% 7 24.1% 29
Type 2 ROP 4 57.1% 3 42.9% 7
RT 1 3 7.9% 35 92.1% 0 0.0% 38
Type 1 ROP 2 5.6% 34 94.4% 36
Advanced ROP 1 50.0% 1 50.0% 2
All 8 6.6% 76 62.3% 38 31.1% 122
  1. 1 RT: requiring treatment