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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