Table 5.

Association between the risk of developing ROP warranting treatment and RBC parameters at birth and on DOL 28.

Parameter	cOR (95% CI)	aOR (95% CI)
Hb at birth < 16.7 g/dL	5.3 (2.4–11.6)	1.9 (0.6–5.8)
Hb on DOL 28 < 9.9 g/dL	3.4 (1.9–6.2)	3.4 (1.5–8.0)
Hct at birth < 49.5%	5.0 (2.1–12.0)	2.2 (0.7–7.3)
Hct on DOL 28 < 31.0%	3.2 (1.8–5.8)	2.5 (1.2–5.5)
MCV at birth > 117.3 fL	5.3 (2.9–9.7)	2.3 (1.0–5.3)
MCV on DOL 28 < 92.3 fL	1.6 (0.8–3.3)	1.6 (0.6–4.4)
MCH at birth > 39.4 pg	2.5 (1.4–4.5)	0.7 (0.3–1.5)
MCH on DOL 28 < 31.8 pg	2.2 (1.2–3.9)	2.2 (0.9–5.6)
RDW at birth > 19.2%	2.3 (0.7–8.2)	1.2 (0.3–5.7)
RDW on DOL 28 > 18.5%	5.8 (3.0–11.3)	2.6 (1.1–6.2)

aOR, adjusted odds ratio; CI, confidence interval; cOR, crude odds ratio; DOL, day of life; Hb, hemoglobin; Hct, hematocrit; MCV, mean corpuscular volume; MCH, mean corpuscular hemoglobin; RDW, red cell distribution width; ROP, retinopathy of prematurity.

aOR: The model was adjusted for potential confounders, including gestational age, birth weight, antenatal steroid use, premature rupture of membrane, inhaled nitric oxide, oxygen supplementation on DOL 28, mechanical ventilation on DOL 28, and red blood cell transfusions.