The same survey reports that university students from the lowest income backgrounds lost more teaching hours as a result of lockdown than those from higher income groups.
Mae'r un arolwg yn adrodd bod myfyrwyr prifysgol o'r cefndiroedd incwm isaf wedi colli mwy o oriau addysgu o ganlyniad i'r cyfyngiadau symud na'r rhai o grwpiau incwm uwch.