Categorisation according to surgical method and indication created eight different groups with different characteristics in gender and age, in addition to indication and use of surgical method. TT=tonsillotomy, TTA=Tonsillotomy+adenoidectomy, TE=Tonsillectomy, TEA=Tonsillectomy+adenoidectomy
| Surgical method - Indication | Sweden (n=20 833) | Norway (n=10 294) | West Jutland, Denmark (n=505) |
| TT obstruction | n=918 | n=376 | n=21 |
| Mean age | 10 (9.6) | 8.23 (9.59) | 13.3 (10.1) |
| Median age (min-max) | 6 (1; 68) | 5 (1; 62) | 10 (1; 38) |
| Female | 417 (45.4%) | 151 (40.2%) | 12 (57.1%) |
| TTA obstruction | n=8417 | n=1104 | n=54 |
| Mean age | 4.81 (2.99) | 4.31 (2.76) | 5.50 (4.74) |
| Median age (min-max) | 4 (0; 58) | 4 (1; 39) | 4 (1; 27) |
| Female | 3559 (42.3%) | 458 (41.5%) | 22 (40.7%) |
| TEA obstruction | n=2238 | n=1102 | n=14 |
| Mean age | 6.135 6 | 4.93 (3.83) | 12.9 (9.4) |
| Median age (min-max) | 5 (0; 64) | 4 (1; 42) | 11.5 (3; 31) |
| Female | 988 (44.1%) | 491 (44.6%) | 8 (57.1%) |
| TEA recurrent tonsillitis | n=552 | n=626 | n=27 |
| Mean age | 7.63 (5.10) | 5.60 (4.46) | 11.4 (7.2) |
| Median age (min-max) | 6 (1; 40) | 4 (1; 39) | 10 (3; 26) |
| Female | 281 (50.9%) | 292 (46.6%) | 21 (77.8%) |
| TE obstruction | n=1380 | n=603 | n=49 |
| Mean age | 22.1 (13.5) | 18.6 (13.4) | 26.6 (10.4) |
| Median age (min-max) | 20 (1; 83) | 17 (2; 72) | 26 (3; 60) |
| Female | 584 (42.3%) | 265 (43.9%) | 23 (46.9%) |
| TE Chronic tonsillitis | n=2598 | n=2808 | n=53 |
| Mean age | 24.7 (11.1) | 23.4 (10.4) | 28 (13.5) |
| Median age (min-max) | 22 (2; 83) | 21 (2; 80) | 23 (7; 65) |
| Female | 1697 (65.3%) | 1904 (67.8%) | 37 (69.8%) |
| TE recurrent tonsillitis | n=2900 | n=3011 | n=169 |
| Mean age | 20.9 (10.3) | 20.4 (9.5) | 20.9 (10) |
| Median age (min-max) | 20 (2; 66) | 19 (2; 67) | 19 (4; 61) |
| Female | 1885 (65.0%) | 2029 (67.4%) | 117 (69.2%) |
| TE peritonsillitis | n=1079 | n=178 | n=34 |
| Mean age | 29 (13.6) | 29.1 (15.2) | 28.8 (17.6) |
| Median age (min-max) | 26 (2; 75) | 25 (0; 79) | 22.5 (4; 68) |
| Female | 534 (49.5%) | 98 (55.1%) | 17 (50.0%) |
TE, tonsillectomy; TEA, Tonsillectomy and Adenoidectomy; TT, tonsillotomy; TTA, Tonsillectomy and Adenoidectomy.