Age distribution
| Age class (years) | 2005, n (%) | 2006, n (%) | Total, n (%) |
| 18–19 | 674 (0.36) | 626 (0.31) | 1300 (0.33) |
| 20–29 | 4321 (2.32) | 4329 (2.15) | 8650 (2.23) |
| 30–39 | 7290 (3.91) | 7071 (3.51) | 14 361 (3.70) |
| 40–49 | 10 213 (5.47) | 10 712 (5.31) | 20 925 (5.39) |
| 50–59 | 13 448 (7.21) | 15 094 (7.48) | 28 542 (7.35) |
| 60–69 | 28 380 (15.21) | 30 569 (15.15) | 58 949 (15.18) |
| 70–79 | 48 904 (26.20) | 53 498 (26.52) | 102 402 (26.37) |
| 80–89 | 52 258 (28.00) | 58 965 (29.23) | 111 223 (28.64) |
| ⩾90 | 21 157 (11.34) | 20 849 (10.34) | 42 006 (10.82) |
| Total patients with valid data | 186 645 | 201 713 | 388 358 |
Forty-eight cases of the total sample had no valid age data.