Table 2

Comparison of radiographic methods for assessment of hip osteoarthritis

Radiographic method		Definition of disease positive		Disease positive (%)		Within- observer reliability	Between-observer reliability
Radiographic method		Definition of disease positive		Disease positive (%)		Within- observer reliability	Reader 1 v 2	Reader 1 v 3
Minimum joint space	⩽2.5 mm	10.0	0.936^2-150		0.960^2-150	0.811^2-150
Kellgren/Lawrence	⩾grade 2	9.2	0.761^2-151		0.646^2-151	0.598^2-151