Table 2.

Estimated longitudinal age trend for women

Location	Curve Equation	R square
	$\mathrm{Incidence}\mathrm{rate}=a*e^{-{\left(\frac{mean\_age-b}{c}\right)}^2}$
Brazil	a = 3.955 ∗ 10−3; b = 64.51; c = 25.90	0.9045
China	a = 3.098 ∗ 10−3; b = 57.29; c = 18.77	0.9798
India	a = 2.756 ∗ 10−3; b = 67.72; c = 29.46	0.7953
Russia	a = 2.041 ∗ 10−3; b = 64.79; c = 21.24	0.9705
South Africa	a = 6.744 ∗ 10−3; b = 67.24; c = 20.03	0.9540

Note: b indicates the age when the incidence rate in the positive fit curve peaks