Table 3.
Time course of LSS-positive and LSS-negative by age group
| Age in 2004 (years) | Time course of LSS
|
|||||
|---|---|---|---|---|---|---|
| LSS(+) in 2004 → 2005 (%)
|
LSS(−) in 2004 → 2005 (%)
|
|||||
| (+) → (+) | (+) → (−) | N | (−) → (+) | (−) → (−) | N | |
| 40–49 | 3 (60) | 2 (40) | 5 | 1 (2.5) | 39 (97.5) | 40 |
| 50–59 | 5 (27.8) | 13 (72.2) | 18 | 10 (8.9) | 102 (91.1) | 112 |
| 60–69 | 37 (51.4) | 35 (48.6) | 72 | 26 (9.5) | 248 (90.5) | 274 |
| 70–79 | 61 (46.9) | 69 (53.1) | 130 | 32 (10.0) | 287 (90.0) | 319 |
| ≥80 | 18 (40.9) | 26 (59.1) | 44 | 14 (21.2) | 52 (78.8) | 66 |
Notes: There was no tendency for improvement from LSS-positive in 2004 to LSS-negative in 2005 with age. On the other hand, the prevalence of LSS-positive in 2005 from LSS-negative in 2004 increased with age.
Abbreviation: LSS, lumbar spinal stenosis.