Table 2 Interactions between the individual radiographic features of lumbar disc degeneration by vertebral level.

Interaction	L1/2	L2/3	L3/4	L4/5	All
Osteophytes × sclerosis	2.7 (2.1 to 3.4)	2.9 (2.3 to 3.7)	2.4 (2 to 3)	3.1 (2.3 to 4.3)	2.7 (2.4 to 3.1)
Sclerosis × narrowing	2.2 (1.7 to 2.8)	2.0 (1.6 to 2.5)	2 (1.7 to 2.5)	2.3 (1.8 to 2.9)	1.9 (1.7 to 2.1)
Osteophytes × narrowing	1.3 (1.1 to 1.6)	1.2 (1 to 1.4)	1.2 (1 to 1.4)	1.2 (1 to 1.3)	1.2 (1.1 to 1.3)

Values are given as β coefficient (95% CI).