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. Author manuscript; available in PMC: 2014 Jun 16.
Published in final edited form as: Arch Ophthalmol. 2012 Aug;130(8):992–999. doi: 10.1001/archophthalmol.2012.243

Table 3.

Alarm Signal in Relation to ROP Categories and Birth Characteristics

Alarm Status
No Alarm Alarm All Infants
Infants, No. (%) 605 (35.5) 1101 (64.5) 1706
ROP categories, No.
    None 484 396 880 (51.6)
    Non-PT 117 488 605 (35.5)
    Type 2 2 73 75 (4.4)
    Type 1 2 144 146 (8.6)
    Treated 4 145 149 (8.7)
Birth characteristics, median (range)
    GA, wk 29 (23-31) 27 (22-31) 28 (22-31)
    BW, g 1385 (625-2240) 850 (378-1720) 1016 (378-2240)

Abbreviations: BW, birth weight; GA, gestational age; PT, prethreshold; ROP, retinopathy of prematurity.