Region-specific associations between latitude and time-adjusted, age-standardised prevalence
| Region | No of age-standardised prevalence estimates | Midpoint latitude | Slope 95% CI* |
| Australasia | 27 | 35.51 | 8.38 (5.77 to 10.98)‡ |
| Western Europe | 114 | 50.75 | 8.11 (3.85 to 12.35)† |
| UK region | 21 | 54.64 | 19.81 (7.11 to 32.51)† |
| Scandinavia and North Atlantic | 41 | 61.25 | –4.29 (–7.59 to –0.99)† |
| Atlantic and Central Europe | 20 | 46.25 | 2.82 (0.42 to 5.21)† |
| Italian region | 31 | 41.32 | –11.59 (–20.17 to –3.02)† |
| Eastern Europe | 48 | 47.24 | –0.76 (–4.67 to 3.15) |
| North America | 30 | 44.06 | 15.35 (6.37 to 24.32)‡ |
| Latin America and the Caribbean | 4 | 20.76 | 0.06 (–1.56 to 1.68) |
| Middle East and Africa | 11 | 31.83 | 1.62 (4.26 to 7.50) |
| Asia and Pacific Islands | 6 | 32.94 | 0.90 (–3.24 to 5.03) |
* Slope (95% CI) =change in prevalence/100 000 per degree of latitude (95% CI).
† Statistically significant (p<0.05).
‡ Statistically significant (p<0.001).
Data for Australasia, Western Europe including the UK region, the Scandinavia and North Atlantic region, the Atlantic and Central Europe region, the Italian region, the Eastern Europe region, and Malta, North America, Latin America and the Caribbean, the Middle East and Africa region, and the Asia and Pacific Islands region.