| Unfavourable lifestyle | Intermediate lifestyle | Favourable lifestyle |
---|---|---|---|
No CMDs | Â | Â | Â |
Number of dementia cases/person-years | 132/ 66 452 | 480/ 281 044 | 284/ 211 743 |
Incidence rate per 1000 person-years (95% CI) | 1.99 (1.67–2.36) | 1.71 (1.56–1.87) | 1.34 (1.19–1.51) |
Absolute rate difference per 1000 person-years (95% CI) | 1 (ref) | −0.28 (− 0.65 to 0.09) | −0.65 (− 1.02 to − 0.27) |
HR (95% CI)* | 1 (ref) | 0.87 (0.72–1.06) | 0.71 (0.58–0.88) |
P value | Â | 0.18 | 0.002 |
1 CMD | Â | Â | Â |
Number of dementia cases/person-years | 421/ 167 252 | 1287/ 636 725 | 667/ 392 382 |
Incidence rate per 1000 person-years (95% CI) | 2.52 (2.29–2.77) | 2.02 (1.91–2.14) | 1.70 (1.58–1.83) |
Absolute rate difference per 1000 person-years (95% CI) | 1 (ref) | −0.50 (− 0.76 to − 0.23) | −0.82 (− 1.09 to − 0.54) |
HR (95% CI) | 1 (ref) | 0.81 (0.73–0.91) | 0.70 (0.61–0.79) |
P value |  | < 0.001 | < 0.001 |
2 CMDs | Â | Â | Â |
Number of dementia cases/person-years | 234/47 910 | 492/131 407 | 209/60 867 |
Incidence rate per 1000 person-years (95% CI) | 4.88 (4.30–5.55) | 3.74 (3.43–4.09) | 3.43 (3.00–3.93) |
Absolute rate difference per 1000 person-years (95% CI) | 1 (ref) | −1.14 (− 1.85 to − 0.43) | −1.45 (− 2.23 to − 0.67) |
HR (95% CI) | 1 (ref) | 0.76 (0.65–0.89) | 0.71 (0.58–0.86) |
P value |  | < 0.001 | < 0.001 |
≥ 3 CMDs |  |  |  |
Number of dementia cases/person-years | 111/10 787 | 128/20 684 | 34/7312 |
Incidence rate per 1000 person-years (95% CI) | 10.3 (8.54–12.4) | 6.19 (5.20–7.36) | 4.65 (3.32–6.51) |
Absolute rate difference per 1000 person-years (95% CI) | 1 (ref) | −4.10 (− 6.30 to − 1.91) | −5.64 (− 8.11 to − 3.17) |
HR (95% CI) | 1 (ref) | 0.57 (0.44–0.74) | 0.42 (0.28–0.63) |
P value |  | < 0.001 | < 0.001 |