Table 2. Risk of cervical stenosis according to variables (Instituto Fernandes Figueira, 2006).
| Variable | Cases of stenosis (n) | Length of follow-up | p-value* | Rate ratio | Confidence interval (95%) |
|---|---|---|---|---|---|
| Age† | 0.26 | 0.67-4.11 | |||
| Older than 43 years | 14 | 3493 | 1.66 | ||
| Up to 43 years | 7 | 2898 | 1 | ||
| Postmenopausal | 0.30 | 0.65-3.96 | |||
| Yes | 7 | 1522 | 1.66 | ||
| No | 14 | 4869 | 1 | ||
| Vaginal delivery | 0.24 | 0.10-1.85 | |||
| No | 2 | 1252 | 0.43 | ||
| Yes | 19 | 5139 | 1 | ||
| Previous LLETZ | 0.40 | 0.43-7.92 | |||
| Yes | 2 | 345 | 1.84 | ||
| No | 19 | 6046 | 1 | ||
| Previous electrocauterization – n (%) | Could not be evaluated because of the presence of zero values | ||||
| Type of procedure | 0.37 | 0.62-3.46 | |||
| SWETZ | 11 | 2738 | 1.47 | ||
| LLETZ-cone | 10 | 3653 | 1 | ||
| Yes | 2 | 208 | 3.3 | ||
| No | 18 | 6183 | 1 | ||
| Volume of the specimen (cm3)† | 0.22 | 0.25-1.40 | |||
| Greater than 7 | 9 | 3573 | 0.59 | ||
| Up to 7 | 12 | 2818 | 1 | ||
| Fragmentation of the specimen | 0.8 | 0.25-2.91 | |||
| Yes | 3 | 1020 | 0.86 | ||
| No | 18 | 5251 | 1 | ||
*
chi-squared test;
†
The cutoff points for the continuous variables of age and volume were obtained through calculating the mean for the population in the cohort.
LLETZ = large-loop excision of the transformation zone; SWETZ = straight-wire excision of the transformation zone.