Table 2.

Table comparing demographic profile of ROP studies across the world

Author	Duration	Place	Percentage of ROP	Mean Birth Weight (in grams)	Mean Gestational Age (in weeks)	Percentage with Severe ROP
Iu, 2017[5]	1 year	Hong Kong	16.9%	846	27	3.4%
Li, 2013[6]	10 years	Taiwan	37.8%	940	27	11.7%
Fortesfilho, 2009[7]	5 years	Brazil	25.5%	1050	29	5.8%
Thomas, 2015[26]	8 years	Canada	NA	771	25.4	12.7%
Hungi, 2011[12]	1.5 years	South India	41.5%	1555	32.2	10.2%
Charan, 1995[13]	1 year	North India	47.3%	1285	31.5	24.4%
Ahuja, 2018[15]	1.5 year	South India	32.6%	1285	29.71	4.3%
Vasavada, 2018[16]	1.5 year	Western India	19.3%	1560	30.3	10.3%
Kumar, 2011[22]	5 years	North India	11.9%	NA	NA	4.7%
Present study	5 years	North India	32.3%	1277	29.5	17.7%