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Table 1 Birth weight, gestational age and postmentrual age at the time of diagnosis or presentation 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)

  Prematures BW (g) (CI 95%) [range] GA (CI 95%) [range] 1st Ev2 (CI 95%) [range] PMA (CI 95%) [range] Last Ev2 (CI 95%) [range] No Ev2 (CI 95%) [range]
n %
non RT 1 94 71.2% 1707 ± 121 33w 2d ± 0w 4d 37w 3d ± 0w 5d 38w 4d ± 0w 5d 43w 6d ± 1w 2d 3.62 ± 0.65
[630, 4700] [27w 0d, 42w 0d] [31w 0d, 51w 0d] [33w 0d, 50w 6d] [35w 0d, 71w 0d] [1, 15]
Mature Retina 10 7.6% 2331 ± 553 36w 2d ± 1w 2d 40w 5d ± 1w 6d 40w 5d ± 1w 6d 40w 5d ± 1w 6d 1.00 ± 0
[1720, 4700] [32w 0d, 40w 0d] [34w 6d, 44w 2d] [34w 6d, 44w 2d] [34w 6d, 44w 2d] [1]
Immature Retina 48 36.4% 1801 ± 151 33w 5d ± 0w 5d 38w 2d ± 1w 0d 38w 2d ± 1w 0d 41w 6d ± 1w 3d 2.23 ± 0.48
[1010, 3600] [28w 0d, 42w 0d] [32w 0d, 51w 0d] [33w 0d, 50w 6d] [35w 0d, 56w 0d] [1, 9]
Mild ROP 29 22.0% 1433 ± 141 31w 6d ± 0w 6d 35w 5d ± 1w 2d 38w 4d ± 1w 2d 47w 6d ± 2w 4d 6.31 ± 1.27
[630, 2560] [27w 0d, 36w 0d] [31w 0d, 50w 0d] [33w 4d, 49w 5d] [38w 0d, 71w 0d] [1, 15]
Type 2 ROP 7 5.3% 1304 ± 278 31w 0d ± 0w 5d 34w 5d ± 1w 3d 37w 0d ± 3w 0d 45w 3d ± 6w 1d 5.71 ± 2.52
[950, 1830] [29w 0d, 32w 0d] [31w 0d, 37w 0d] [33w 5d, 45w 4d] [35w 0d, 55w 0d] [2, 12]
RT 1 38 28.8% 1316 ± 110 30w 4d ± 0w 5d 35w 1d ± 0w 6d 37w 3d ± 0w 5d 47w 3d ± 2w 3d 8.84 ± 1.13
[830, 2220] [26w 0d, 35w 0d] [29w 0d, 40w 0d] [31w 1d, 42w 1d] [33w 0d, 66w 0d] [3, 16]
Type 1 ROP 36 27.3% 1310 ± 112 30w 4d ± 0w 5d 34w 6d ± 0w 5d 37w 2d ± 0w 5d 46w 4d ± 2w 1d 8.91 ± 1.13
[830, 2220] [26w 0d, 35w 0d] [29w 0d, 40w 0d] [31w 1d, 42w 1d] [33w 0d, 66w 0d] [3, 16]
Advanced ROP 2 1.5% 1425 ± 735 29w 3d ± 4w 6 d 39w 1d ± 1w 6d 39w 1d ± 1w 6d 63w 0d ± 5w 6d 5.00 ± 1.96
[1050, 1800] [27w 0d, 32w 0d] [38w 0d, 40w 0d] [38w 2d, 40w 1d] [60w 0d, 66w 0d] [4, 6]
  1. 1 RT: requiring treatment
  2. 2 Ev: evaluation