Table 1.
Demographic and clinical characteristics of the cohort
| All appendicectomies 1987–2013 | Appendicectomy with appendicitis 1987–2009 | |||||
|---|---|---|---|---|---|---|
| Appendicitis all grades (n = 53 478) | Negative appendicectomy (n = 8197) | Total (n = 61 675) | Non‐perforated appendicitis (n = 37 887) | Perforated appendicitis (n = 9790) | Total (n = 47 677) | |
| Age (years)* | 10·8(2·9) | 10·3(3·1) | 10·7(2·9) | 11·1(2·7) | 9·9(3·5) | 10·8(2·9) |
| Age group (years) | ||||||
| 0–4 | 2566 (81·4) | 585 (18·6) | 3151 | 1019 (46·7) | 1161 (53·3) | 2180 |
| 5–9 | 15 966 (85·5) | 2701 (14·5) | 18 667 | 10 912 (76·8) | 3300 (23·2) | 14 212 |
| 10–14 | 34 946 (87·7) | 4911 (12·3) | 39 857 | 25 956 (83·0) | 5329 (17·0) | 31 285 |
| Sex ratio (M : F) | 30 570 : 22 908 | 3449 : 4748 | 34 019 : 27 656 | 21 816 : 16 071 | 5285 : 4505 | 27 101 : 20 576 |
| Type of surgery | ||||||
| Laparoscopic | 5137 (95·3) | 252 (4·7) | 5389 | 2097 (82·6) | 441 (17·4) | 2538 |
| Open | 48 341 (85·9) | 7945 (14·1) | 56 286 | 35 790 (79·3) | 9349 (20·7) | 45 139 |
| Healthcare region | ||||||
| Northern | 5569 (85·2) | 964 (14·8) | 6533 | 4065 (79·7) | 1035 (20·3) | 5100 |
| Stockholm | 10 245 (91·1) | 997 (8·9) | 11 242 | 6514 (74·7) | 2203 (25·3) | 8717 |
| South‐Eastern | 5884 (84·6) | 1073 (15·4) | 6957 | 4268 (79·6) | 1095 (20·4) | 5363 |
| Southern | 8334 (85·7) | 1387 (14·3) | 9721 | 6012 (80·7) | 1435 (19·3) | 7447 |
| Uppsala/Örebro | 12 225 (86·0) | 1996 (14·0) | 14 221 | 8946 (80·8) | 2122 (19·2) | 11 068 |
| Western | 11 221 (86·3) | 1780 (13·7) | 13 001 | 8082 (81·0) | 1900 (19·0) | 9982 |
| Year of treatment | ||||||
| 1987–1989 | 7198 (77·9) | 2045 (22·1) | 9243 | 5961 (82·8) | 1237 (17·2) | 7198 |
| 1990–1994 | 10 708 (81·1) | 2498 (18·9) | 13 206 | 8661 (80·9) | 2047 (19·1) | 10 708 |
| 1995–1999 | 11 298 (87·6) | 1592 (12·4) | 12 890 | 8890 (78·7) | 2408 (21·3) | 11 298 |
| 2000–2004 | 10 688 (90·5) | 1121 (9·5) | 11 809 | 8336 (78·0) | 2352 (22·0) | 10 688 |
| 2005–2009 | 7785 (92·8) | 607 (7·2) | 8392 | 6039 (77·6) | 1746 (22·4) | 7785 |
| 2010–2013 | 5801 (94·6) | 334 (5·4) | 6135 | † | † | 5801 |
Values in parentheses are percentages unless indicated otherwise;
*
values are mean(s.d.).
†
Data in the National Patient Register on subclassification into non‐perforated and perforated appendicitis were not valid from 201017.