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. Author manuscript; available in PMC: 2023 Jan 1.
Published in final edited form as: Am J Ophthalmol. 2021 Jul 21;233:189–215. doi: 10.1016/j.ajo.2021.07.016

Table 3.

Characteristics of All Patients Diagnosed with ROP

Number of patients with ROP 2,198.0
ROP Incidence 29.6%
Gender (Number of male/total, %) 183/353 51.8%
Multiple Gestation (n, %) 354 16.1% p = 0.015#
ROP Severity
 Zone (mean, std dev) 2.0 0.37
 Stage (mean, std dev) 1.8 0.75
Birth Weight
Mean, std dev (g) 822.9 407.3 p < 0.0001*
Proportion (n, %)
 < 750g 935 44.6% p < 0.0001#
 751–1000g 725 34.6%
 1001–1250g 314 15.0%
 1251–1500g 101 4.8%
 >1500g 23 1.1%
Gestational Age
Mean, std dev (weeks) 26.3 2.3 p < 0.0001*
Proportion (n, %)
 <27w 1,275 60.8% p < 0.0001#
 27–32w 763 36.4%
 >32w 60 2.9%
*

t-test

#

chi-square, all p-values comparing patients with ROP versus those without ROP

Abbreviations: n - number, g - grams, w - weeks, std dev - standard deviation