Table 1. Values of the constant A for the line F=Ax.

Speculum	Stiffness (N/mm)	R2
Disposable 1	0.0871	0.992
Disposable 2	0.1037	0.992
Disposable 3	0.0968	0.996
Disposable 4	0.0988	0.996
Reusable 1	0.1375	0.987
Reusable 2	0.1327	0.997
Reusable 3	0.1325	0.997
Reusable 4	0.1364	0.997

R² is a squared correlation coefficient and shows how well the line fits the data points.