Table 3.

Comparison of stage and zone wise distribution of ROP among different studies

Author	Place	Stage I	Stage II	Stage III	Stage IV	Stage V	APROP
Iu, 2017[5]	Hong Kong	60%	20%	20%	0	0	0
Li, 2013[6]	Taiwan	32.1%	18.9%	42.6%	5.7%	0.6%	0
Fortesfilho, 2009[7]	Brazil	44.23%	32.69%	21.15%	0.96%	0.96%	0
Gerull, 2017[8]	Switzerland	49.3%	31.1%	18.9%	0.2%	0.5%	0
Hungi, 2011[12]	South India	28.6%	56%	2.2%	0	0	13.2%
Charan, 1995[13]	North India	35.9%	37.2%	24.4%	2.5%	0	0
Present Study	North India	12.2%	33.8%	12.9%	6.3%	13.5%	20.4%a
	Zone I			Zone II			Zone III
Hungi, 2011[12]	15.4%			31.9%			52.7%
Kumar, 2011[22]	1.2%			76.2%			22.6%
Present study	7.2%			92.1%			0.7%