Table 1.
Demographics of cohort by year of study time frame
| Year | No. of admissions | No. of operations* | No. of male patients* | No. of female patients* | Median age (years)† | Significant co‐morbidity (CCI > 4)* | Moderate co‐morbidity (CCI 1–4)* | No co‐morbidity (CCI 0)* |
|---|---|---|---|---|---|---|---|---|
| 1996 | 47 803 | 13 749 (28·8) | 24 189 (50·6) | 23 614 (49·4) | 52 (33–71) | 763 (1·6) | 14 006 (29·3) | 33 034 (69·1) |
| 1997 | 65 033 | 19 073 (29·3) | 32 773 (50·4) | 32 260 (49·6) | 52 (33–70) | 1139 (1·8) | 18 860 (29·0) | 45 034 (69·2) |
| 1998 | 65 232 | 19 352 (29·7) | 32 751 (50·2) | 32 481 (49·8) | 52 (34–70) | 1172 (1·8) | 19 680 (30·2) | 44 380 (68·0) |
| 1999 | 65 817 | 19 398 (29·5) | 33 270 (50·5) | 32 547 (49·5) | 51 (34–70) | 1253 (1·9) | 18 806 (28·6) | 45 758 (69·5) |
| 2000 | 69 774 | 19 936 (28·6) | 35 235 (50·5) | 34 538 (49·5) | 52 (34–70) | 1332 (1·9) | 19 599 (28·1) | 48 843 (70·0) |
| 2001 | 71 977 | 20 358 (28·3) | 36 150 (50·2) | 35 827 (49·8) | 52 (34–70) | 1304 (1·8) | 20 347 (28·3) | 50 326 (69·9) |
| 2002 | 71 823 | 20 042 (27·9) | 36 355 (50·6) | 35 468 (49·4) | 52 (35–70) | 1269 (1·8) | 19 918 (27·7) | 50 636 (70·5) |
| 2003 | 71 278 | 20 470 (28·7) | 35 100 (49·2) | 36 178 (50·8) | 53 (35–71) | 1226 (1·7) | 20 163 (28·3) | 49 889 (70·0) |
| 2004 | 72 313 | 20 961 (29·0) | 35 536 (49·1) | 36 777 (50·9) | 53 (36–71) | 1232 (1·7) | 20 555 (28·4) | 50 526 (69·9) |
| 2005 | 70 909 | 20 687 (29·2) | 34 326 (48·4) | 36 583 (51·6) | 53 (36–71) | 1310 (1·8) | 20 033 (28·3) | 49 566 (69·9) |
| 2006 | 71 073 | 20 770 (29·2) | 34 118 (48·0) | 36 955 (52·0) | 53 (36–71) | 1157 (1·6) | 19 686 (27·7) | 50 230 (70·7) |
| 2007 | 73 585 | 20 994 (28·5) | 35 508 (48·3) | 38 077 (51·7) | 53 (36–71) | 1176 (1·6) | 20 093 (27·3) | 52 316 (71·1) |
| 2008 | 76 278 | 21 454 (28·1) | 36 515 (47·9) | 39 763 (52·1) | 52 (36–70) | 1089 (1·4) | 20 305 (26·6) | 54 884 (72·0) |
| 2009 | 77 861 | 21 022 (27·0) | 36 879 (47·4) | 40 980 (52·6) | 52 (36–70) | 1239 (1·6) | 20 751 (26·7) | 55 871 (71·8) |
| 2010 | 76 756 | 20 136 (26·2) | 35 914 (46·8) | 40 840 (53·2) | 53 (36–70) | 1261 (1·6) | 20 088 (26·2) | 55 407 (72·2) |
| 2011 | 79 453 | 20 323 (25·6) | 36 940 (46·5) | 42 513 (53·5) | 52 (35–70) | 1225 (1·5) | 20 328 (25·6) | 57 900 (72·9) |
| 2012 | 81 568 | 19 607 (24·0) | 37 067 (45·4) | 44 500 (54·6) | 52 (35–70) | 1298 (1·6) | 20 587 (25·2) | 59 683 (73·2) |
| 2013 | 81 475 | 19 650 (24·1) | 36 610 (44·9) | 44 865 (55·1) | 52 (35–70) | 1285 (1·6) | 20 272 (24·9) | 59 918 (73·5) |
| 2014 | 80 955 | 19 174 (23·7) | 36 215 (44·7) | 44 740 (55·3) | 53 (35–70) | 1324 (1·6) | 20 292 (25·1) | 59 339 (73·3) |
| 2015 | 79 333 | 17 863 (22·5) | 35 450 (44·7) | 43 882 (55·3) | 53 (35–70) | 1293 (1·6) | 19 549 (24·6) | 58 491 (73·7) |
Values in parentheses are *percentages and †interquartile range.