A large registry study from Sweden ( Sandin et al ., 2013 ) found no overall risk of mental retardation or autistic disorders in ART singletons compared to spontaneously conceived singletons in the main analysis, but a small increase in mental retardation in a subanalysis of ICSI singletons, compared to IVF, being borderline significant for fresh ICSI and significant for frozen ICSI.
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The sentences
In recent years, there has been an increasing trend towards using ICSI not only for treatment of male infertility but also when the sperm quality is normal.