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. Author manuscript; available in PMC: 2014 Dec 11.
Published in final edited form as: Contraception. 2011 Mar 23;84(5):512–519. doi: 10.1016/j.contraception.2011.02.002

Table 2.

Continuous and categorical measures of cervical ectopy (cm2) and change in cervical ectopy by study visit

Baseline 3-month visit 6-month visit 12-month visit
Area of cervix with ectopy
N 802 682 568 602
Mean 0.49 0.36 0.34 0.33
Median 0.21 0.12 0.12 0.14
Categorized area of cervix n (%) n (%) n (%) n (%)
Small (<0.09 cm2) 191 (23.8) 266 (39.0) 236 (41.5) 201 (33.4)
Medium (0.09–0.48 cm2) 403 (50.2) 276 (40.5) 242 (42.6) 298 (49.5)
Large (>0.48 cm2) 208 (25.9) 140 (20.5) 90 (15.8) 103 (17.1)
Ectopy difference Change between baseline and month 3 Change between month 3 and month 6 Change between month 6 and month 12
Mean (95% CI)* −0.13 (−0.17, −0.09) −0.02 (−0.07, 0.02) −0.02 (−0.06, 0.03)
Median (IQR)* −0.05 (−0.19, 0.01) 0.00 (−0.11, 0.07) 0.00 (−0.08, 0.10)
p-value <0.01 0.06 0.27
*

CI: confidence interval; IQR: interquartile range

According to the Wilcoxon signed-rank test