Table 2 Incidence of HIZ on lumbar MR images in various age groups (n = 637)
Age group (years) | HIZ | Total | ||
|---|---|---|---|---|
Present | Absent | Incidence rate (%) | ||
< 20 | 3 | 23 | 11.54 | 26 |
20–29 | 4 | 47 | 7.84 | 51 |
30–39 | 28 | 63 | 30.77 | 91 |
40–49 | 55 | 99 | 35.71 | 154 |
50–59 | 54 | 88 | 38.03 | 142 |
60–69 | 33 | 54 | 37.93 | 87 |
70–79 | 20 | 53 | 27.40 | 73 |
> = 80 | 4 | 9 | 30.77 | 13 |