Age-adjusted prevalence of total diabetes and proportion of undiagnosed diabetes among women and men aged 40–84: the Tromsø Study 1994–2016
| Tromsø 4 | Tromsø 5 | Tromsø 6 | Tromsø 7 | OR (95% CI)* | P value | |
| Prevalence, % (n) | ||||||
| Women | N=2976 | N=3342 | N=6059 | N=10 334 | ||
| Total diabetes† | 3.2 (120) | 5.1 (244) | 6.0 (388) | 5.9 (593) | 1.24 (1.16 to 1.33) | <0.001 |
| Undiagnosed‡ | 32.3 (32) | 41.8 (96) | 31.8 (117) | 17.2 (102) | 0.55 (0.47 to 0.66) | <0.001 |
| Men | N=2895 | N=2445 | N=5416 | N=9504 | ||
| Total diabetes† | 3.7 (132) | 6.6 (242) | 7.8 (440) | 7.9 (746) | 1.31 (1.22 to 1.40) | <0.001 |
| Undiagnosed‡ | 36.5 (38) | 51.4 (121) | 35.2 (142) | 24.2 (178) | 0.60 (0.52 to 0.70) | <0.001 |
Proportions, ORs with CIs and p value for trend are adjusted for age across surveys using generalised estimating equation (GEE) models. N represents crude numbers.
*ORs for proportions are presented per 10 years.
†Total diabetes: self-reported diabetes or HbA1c ≥6.5%.
‡Undiagnosed: proportion of those without self-reported diabetes but HbA1c ≥6.5% among those with diabetes.
HbA1c, glycated haemoglobin.