The Effects of Surface Mechanical Deformation and Bovine Serum Albumin on the Tribological Properties of Polyvinyl Alcohol Hydrogel as an Artificial Cartilage

Table 1

Factors and levels for the design of experiments.

Factor	Level 1	Level 2	Level 3
Load (N)	1	2	3
Speed (Hz)	1 (10 mm/s)	2 (20 mm/s)	—
Lubricant	Deionized water	Albumin solution (1 g/dl)	—