Sociodemographic and socioeconomic description of study population at index date (1January 2014)
| Variable | Group | Total* n (column %) | Prevalence of multimorbidity | |||
| Hospital discharge data (last 5 years) n (%) | Standardised† % | Pharmaceutical data (last year) n (%) | Standardised† % | |||
| Total | Total | 3 489 747 (100.0) | 275 706 (7.9) | 7.9 | 972 222 (27.9) | 27.9 |
| Age group | 18–24 | 454 511 (13.0) | 7258 (1.6) | 1.6 | 36 625 (8.1) | 8.1 |
| 25–34 | 605 263 (17.3) | 12 334 (2.0) | 2.0 | 69 041 (11.4) | 11.4 | |
| 35–44 | 621 645 (17.8) | 18 978 (3.1) | 3.1 | 104 296 (16.8) | 16.7 | |
| 45–54 | 646 669 (18.5) | 33 987 (5.3) | 5.3 | 160 862 (24.9) | 24.9 | |
| 55–64 | 525 600 (15.1) | 48 702 (9.3) | 9.2 | 199 362 (37.9) | 38.0 | |
| 65–74 | 366 866 (10.5) | 62 869 (17.1) | 17.1 | 201 807 (55.0) | 55.0 | |
| 75–84 | 193 497 (5.5) | 59 116 (30.6) | 30.7 | 139 099 (71.9) | 71.7 | |
| 85+ | 75 696 (2.2) | 32 462 (42.9) | 43.3 | 61 130 (80.8) | 80.4 | |
| Sex | Female | 1 807 908 (51.8) | 135 615 (7.5) | 7.3 | 561 921 (31.1) | 30.7 |
| Male | 1 681 839 (48.2) | 140 091 (8.3) | 8.6 | 410 301 (24.4) | 24.8 | |
| Total Ethnicity‡ | NZ European | 2 292 963 (69.6) | 197 471 (8.6) | 7.6 | 725 030 (31.6) | 29.0 |
| Māori | 402 188 (12.2) | 37 111 (9.2) | 13.4 | 97 337 (24.2) | 31.7 | |
| Pacific | 226 503 (6.9) | 21 108 (9.3) | 13.8 | 49 645 (21.9) | 29.8 | |
| Asian | 360 349 (10.9) | 16 726 (4.6) | 6.9 | 68 926 (19.1) | 24.3 | |
| MELAA/Other | 44 056 (1.3) | 2091 (4.7) | 8.7 | 9087 (20.6) | 29.9 | |
| NZDep quintile§ | 1 | 669 348 (19.2) | 37 217 (5.6) | 5.8 | 167 609 (25.0) | 25.1 |
| 2 | 653 071 (18.8) | 44 000 (6.7) | 6.7 | 173 294 (26.5) | 26.3 | |
| 3 | 672 889 (19.3) | 52 417 (7.8) | 7.3 | 191 645 (28.5) | 27.5 | |
| 4 | 737 521 (21.2) | 66 749 (9.1) | 8.7 | 222 336 (30.1) | 29.6 | |
| 5 | 748 339 (21.5) | 74 548 (10.0) | 10.8 | 215 689 (28.8) | 30.9 | |
*Total column reports number of people in each sociodemographic category and their proportion of the total adult population at the index date.
†Standardised to age and sex profile of total study population (aged 18+; age groups as presented). All standardised confidence intervals were narrower than ±0.2%.
‡People identifying with multiple ethnic groups are counted in each of these groups (and so total can sum to >100%). n=192 910 individuals had no ethnicity recorded.
§A total of 140 056 individuals had no NZDep quintile available (could not be matched to a valid NZDep area).