Table 3

Estimated change in prevalence/100 000 per degree of latitude at increments of latitude

Latitude		Prevalence estimates with age-specific data
	All crude	Crude	Age-standardised
	Slope (95% CI)^*	Slope (95% CI)^*	Slope (95% CI)^*
0	0.18 (0.13 to 0.22)^†
5	0.25 (0.20 to 0.31)^†	0.47 (0.33 to 0.62)^†	0.51 (0.36 to 0.67)^†
10	0.36 (0.29 to 0.43)^†	0.60 (0.44 to 0.77)^†	0.66 (0.47 to 0.84)^†
15	0.51 (0.43 to 0.60)^†	0.77 (0.57 to 0.98)^†	0.84 (0.62 to 1.06)^†
20	0.73 (0.62 to 0.85)^†	0.99 (0.74 to 1.24)^†	1.07 (0.80 to 1.35)^†
25	1.04 (0.89 to 1.20)^†	1.27 (0.95 to 1.60)^†	1.37 (1.01 to 1.73)^†
30	1.49 (1.26 to 1.71)^†	1.63 (1.20 to 2.07)^†	1.75 (1.27 to 2.23)^†
35	2.12 (1.78 to 2.46)^†	2.09 (1.48 to 2.70)^†	2.24 (1.57 to 2.90)^†
40	3.02 (2.48 to 3.56)^†	2.68 (1.82 to 3.54)^†	2.86 (1.92 to 3.80)^†
45	4.31 (3.44 to 5.18)^†	3.43 (2.21 to 4.65)^†	3.66 (2.33 to 4.99)^†
50	6.14 (4.73 to 7.55)^†	4.40 (2.66 to 6.14)^†	4.67 (2.78 to 6.56)^†
55	9.61 (7.08 to 12.14)^†	6.13 (3.45 to 8.81)^†	6.51 (3.60 to 9.42)^†
60	−3.17 (−6.40 to 0.05)	−0.94 (−2.82 to 0.94)	−1.15 (−3.42 to 1.13)
65	−12.09 (−15.75 to −8.44)^†	−7.25 (−10.90 to −3.60)^†	−7.87 (−12.07 to −3.66)^†
70	−9.25 (−11.59 to −6.92)^†	−8.34 (−11.21 to −5.47)^†	−8.90 (−12.01 to −5.80)^†

* Slope (95% CI)=change in prevalence/100 000 per degree of latitude at the specified latitude (95% CI).
† Statistically significant (p<0.001).
All analyses were adjusted for prevalence year, use of systematic diagnostic criteria and inclusion of possible cases. Values at 0 latitude were not calculated for crude and age-standardised prevalence with age-specific data, as there was no prevalence at this latitude with age-specific data.