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Table 3 Individual trajectories for changes in size of herniations, dural sacs and disc heights shown by numbers and percentages for all time periods

From: Progression of lumbar disc herniations over an eight-year period in a group of adult Danes from the general population – a longitudinal MRI study using quantitative measures

Structure Time Number of disc levels Decrease Unchanged Increase Fluctuating
Lumbar disc herniations Four-year change 140 19
(14 %)
114
(81 %)
7
(5 %)
-
Eight-year change 80 14
(17,5 %)
52
(65 %)
10
(12,5 %)
4
(5 %)
Dural sac Four-year change 140 25
(18 %)
110
(78,5 %)
5
(3,5 %)
-
Eight-year change 80 23
(29 %)
49
(61 %)
4
(5 %)
4
(5 %)
Disc height Four-year change 140 10
(7 %)
127
(91 %)
3
(2 %)
-
Eight-year change 80 13
(16 %)
62
(78 %)
4
(5 %)
1
(1 %)
  1. Total measurements of disc levels for each time category included. Missing values for “fluctuating” are due to the use of only one time period