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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Am J Obstet Gynecol. 2010 Aug 30;203(5):481.e1–481.e9. doi: 10.1016/j.ajog.2010.06.048

Figure 2.

Figure 2

Number needed to test with endocervical canal curettage (ECC) to detect one additional case of cervical intraepithelial neoplasia grade 2 or worse (CIN2+) among 5,593 referral colposcopically-guided biopsy examinations processed at Alberta Hospital 2003–2007

* NNT was undefined as no CIN2+ was detected in examinations among women age 46+ with ASCUS/AGUS/LSIL cytology referral, high grade colposcopic impression (n=18 satisfactory colposcopy and n=10 with unsatisfactory colposcopy). These categories are excluded from the figure.