Table 2.

Location of the Modic type 1 signal changes (M1) in the subchondral marrow adjacent to the upper and lower endplates of the 120 disc spaces L1/L2–L5/S1 at baseline and after follow-up

Location of M1	Endplate with M1
	Baseline				Follow-up
	Upper n	Lower n	Both n	Both %	Upper n	Lower n	Both n	Both %
Anterior	1	1	2	4	3	4	7	15
Antero-central	15	9	24	44	10	8	18	39
Central	2	4	6	11	6	4	10	22
Postero-central	1	3	4	7	1	1	2	4
Posterior	1	0	1	2	0	1	1	2
Whole end plate	8	9	17	32	3	5	8	18
All	28	26	54	100	23	23	46	100