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Table 1 Cross-sectional areas of LDH, dural sac area, and disc height measured over three time-points (Time 1–3), presented as means with 95 % confidence intervals, for disc levels L3-L4, L4-L5, and L5-S1

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

Level & Time Disc levels (n) Mean size [95 % Confidence Intervals] (mm2)
LDH Dural Sac Intervertebral Height
L3-L4     
 Time 1 9 132 [102; 162] 228 [187; 268] 357 [313; 401]
 Time 2 9 124 [96; 152] 224 [164; 284] 350 [299; 401]
 Time 3 9 125 [93; 156] 223 [161: 286] 351 [302; 399]
L4-L5     
 Time 1 28 145 [133; 158] 228 [204; 252] 423 [398; 447]
 Time 2 28 146 [133; 159] 214 [188; 239] 416 [393; 439]
 Time 3 28 140 [126; 155] 223 [195; 252] 399 [369; 429]
L5-S1     
 Time 1 43 164 [154; 174] 316 [285; 347] 437 [414; 460]
 Time 2 43 166 [155; 177] 309 (276; 341] 436 [411; 461]
 Time 3 43 175 [161; 189] 304 [272; 336] 421 [393; 449]