Table 2.
Odds ratio of preterm birth by timing of colposcopy in relation to birth and depth of excisional procedure
| Procedure at colposcopy | Timing of colposcopy in relation to the birth | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Birth before colposcopy | First births after colposcopy | Second or more births after colposcopy | |||||||
| Term | Preterm | OR (95% CI) | Term | Preterm | OR (95% CI) | Term | Preterm | OR (95% CI) | |
| Punch biopsy Treatment | 110 | 52 | 0.92 (0.57–1.48) | 298 | 166 | 0.90 (0.67–1.22) | 151 | 58 | 1.02 (0.63–1.66) |
| Small excision (1–9 mm deep) | 115 | 59 | Reference | 246 | 145 | Reference | 129 | 43 | Reference |
| Medium excision (10–14 mm deep) | 80 | 49 | 1.17 (0.71–1.90) | 214 | 138 | 1.08 (0.80–1.45) | 128 | 75 | 1.73 (1.09–2.74) |
| Large excision (15–19 mm deep) | 32 | 21 | 1.14 (0.58–2.21) | 56 | 64 | 1.95 (1.28–2.97) | 33 | 23 | 2.01 (1.04–3.88) |
| Very large excision (20+mm deep) | 26 | 7 | 0.50 (0.19–1.30) | 31 | 41 | 2.30 (1.35–3.92) | 13 | 16 | 3.92 (1.66–9.25) |
| Unknown treatment depth | 15 | 8 | 1.17 (0.46–3.00) | 62 | 42 | 1.13 (0.72–1.78) | 38 | 14 | 1.20 (0.58–2.47) |
| Test for trend a | OR 0.98 (0.83–1.16), P = 0.855 | OR 1.23 (1.12–1.36), P < 0.001 | OR 1.34 (1.15–1.56), P < 0.001 | ||||||
a
Linear trend with increasing depth category from small (1) to very large (4).