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[[File:Oester.jpg|left|frame|Percentage of boys with fused foreskin by age according to Øster]]<br clear="all">
Ko ''et al''. (2007) examined 1145 Taiwanese boys aged 7 to 13.Ko ''et al''. reported:<blockquote>Our findings indicate that the degree of preputial retractability increases with age, while the prevalence of unretractable prepuce decreases with age. By the age of 13 years, very few boys (some 0.3%) still had an unretractable prepuce (i.e. type 1 prepuce).<ref name="ko2007" /></blockquote> The findings reported by Ko ''et al."' are consistent with the findings reported by Øster (1968), by Kayaba ''et al''. (1996), and by Thorvaldsen & Meyhoff (2005)
== Discussion ==
|url=http://www.cirp.org/library/treatment/phimosis/orsola1/
|quote=
|pubmedID= 10925099
|pubmedCID=
|DOI=10.1016/s0090-4295(00)00576-8