| 2004 | 2012 | |
| No (thousands) | No (thousands) (95% CI) | |
| Men | ||
| 19–34 | 861 | 1350 (1042 to 1657) |
| 35–54 | 1838 | 2543 (2396 to 2690) |
| 55–74 | 1380 | 1909 (1722 to 2096) |
| 75+ | 260 | 446 (346 to 547) |
| Total 19+* | 4458 | 6401 (6061 to 6741) |
| Non-manual | 2143 | 3120 (2774 to 3465) |
| Manual | 2271 | 3199 (3043 to 3355) |
| Women | ||
| 19–34 | 890 | 1347 (1165 to 1528) |
| 35–54 | 1737 | 2247 (2011 to 2484) |
| 55–74 | 1558 | 1994 (1755 to 2233) |
| 75+ | 481 | 722 (550 to 894) |
| Total 19+* | 4837 | 6501 (6066 to 6935) |
| Non-manual | 2979 | 3866 (3350 to 4381) |
| Manual | 1797 | 2478 (2147 to 2808) |
*Totals obtained by applying the age-adjusted prevalence in the whole population to the population figures, not by summing the numbers in each age group.