In fact, the survey showed that only 12% of those over 30 used the form 'zee'. This is hypothesized to be tied to an American children's song frequently used to teach the alphabet. In this song, the rhyme scheme matches the letter Z with V 'vee', prompting the use of the American pronunciation.
Contrary to expectations, the survey found that only 12% of people over 30 used the 'zee' form, and it is suggested that this may be due to a popular American children's song commonly taught to teach the alphabet. The song's rhyme scheme associates Z with V 'vee', leading to the adoption of the American pronunciation.