Table 4.

Additional exam burden and delay at gestational age (GA) at discharge for each progression of ROP (total exams = 4183)

ROP progression
GA category	No ROP to stage 1	Stage 1 to stage 2	Stage 2 to stage 3
22–24 weeks
Additional exams	77 (1.8%)	298 (7.1%)	140 (3.3%)
GA at discharge	+2.2 weeks	+1.5 weeks	+3.2 weeks
25–27 weeks
Additional exams	298 (7.1%)	291 (7.0%)	144 (3.4%)
GA at discharge	+1.5 weeks	+2.0 weeks	+3.1 weeks
28–30 weeks
Additional exams	132 (3.2%)	48 (1.1%)	21 (0.5%)
GA at discharge	+1.9 weeks	+1.9 weeks	+5.6 weeks