en: Other factors include boys' changing voices, broad range of after-school activities and various operational parts of choirs such as rehearsal times, repertoire preferences, choral conductors and teaching methods.
is: Raddbreytingar, mikið tómstundaframboð og þættir tengdir fyrirkomulagi kórastarfs eins og æfingatími, lagaval og kennsluaðferðir kórstjóra hafa einnig áhrif.