Table 1

Patient data

Gender (n (%))
 Male32 (64)
 Female18 (36)
Age (mean (range))41 (25–61)
Smoking (n (%))
 Positive34 (68)
 Negative16 (32)
Nucleoplasty (n (%))
 On one level32 (64)
 On two levels18 (36)