Categorising Hiatus Hernias by size!!

Just wondering what constitutes the various sizes of HH's?

Yesterday I was diagnosed with a moderate sized 'rolling' HH and a moderate sized 'sliding' HH. Needless to say in just over 24 hours I have done a crash course of these HH's!! However I have not been able to find any info on relative sizes for severities eg. 1cm = small, 2 cm = medium, 4 cm = large etc. Does anyone have a clue?

Can I also clarify that my understanding of a 'rolling' HH is that it is often called a para-oesophageal hernia and is more rare than the sliding HH plus potentially more dangerous? What is the prevailing best practise regarding 'rolling' HH's in regard to surgery? Also if surgery is indicated, has the reputation and outcomes for laparoscopic repair improved since early 2000 research studies or is thoracotomy or laparotomy still considered to produce better results?