Table 3.
Number and prevalence of participants with mild cognitive impairment and dementia
| Number of respondents | Number of dementia cases | Standardized dementia prevalence* | 95% confidence interval | Number of MCI cases | Standardized MCI prevalence* | 95% confidence interval | |
| Total | |||||||
| 70–74 | 4,014 | 234 | 5.6% | (4.9–6.3) | 1,451 | 36.0% | (34.5–37.6) |
| 75–79 | 2,575 | 263 | 9.5% | (8.4–10.7) | 938 | 36.6% | (34.7–38.6) |
| 80–84 | 1,564 | 303 | 17.9% | (16.0–20.0) | 513 | 32.9% | (30.4–35.5) |
| 85–89 | 901 | 333 | 33.0% | (29.7–36.5) | 293 | 33.2% | (29.8–36.8) |
| 90+ | 609 | 337 | 48.1% | (43.0–53.3) | 187 | 35.7% | (30.7–41.1) |
| Overall | 9,663 | 1470 | 14.6% | (13.9–15.4) | 3,382 | 35.3% | (34.3–36.4) |
| Men | |||||||
| 70–74 | 1,955 | 124 | 6.4% | (5.4–7.6) | 710 | 36.5% | (34.4–38.7) |
| 75–79 | 1,203 | 130 | 10.0% | (8.5–11.8) | 517 | 43.4% | (40.6–46.3) |
| 80–84 | 711 | 131 | 17.8% | (15.2–20.8) | 249 | 34.8% | (31.3–38.4) |
| 85–89 | 337 | 114 | 30.4% | (25.9–35.4) | 119 | 36.9% | (31.8–42.3) |
| 90+ | 200 | 99 | 41.5% | (34.6–48.7) | 65 | 36.2% | (29.1–44.0) |
| Overall | 4,406 | 598 | 13.0% | (12.1–14.0) | 1,660 | 38.1% | (36.7–39.6) |
| Women | |||||||
| 70–74 | 2,059 | 110 | 4.8% | (4.0–5.8) | 741 | 35.6% | (33.5–37.8) |
| 75–79 | 1,372 | 133 | 9.0% | (7.5–10.7) | 421 | 30.6% | (28.0–33.3) |
| 80–84 | 853 | 172 | 18.0% | (15.4–21.0) | 264 | 31.5% | (28.0–35.1) |
| 85–89 | 564 | 219 | 34.6% | (30.1–39.3) | 174 | 30.9% | (26.5–35.7) |
| 90+ | 409 | 238 | 50.9% | (44.2–57.6) | 122 | 35.5% | (29.1–42.5) |
| Overall | 5,257 | 872 | 15.9% | (14.8–17.0) | 1,722 | 33.0% | (31.6–34.5) |
*Standardization done in two steps: 1) Weighted (inverse probability weighting) to account for non-response by sex, age, municipality and nursing home. 2) Standardized (calibrated) to correspond to the distribution in Norway according to sex, age and education in 2019.