Defining Success After Surgery for Pelvic Organ Prolapse
Open accessAbstract
OBJECTIVES: To describe pelvic organ prolapse surgical success rates using a variety of definitions with differing requirements for anatomic, symptomatic, or re-treatment outcomes. METHODS: Eighteen different surgical success definitions were evaluated in participants who underwent abdominal sacrocolpopexy within the Colpopexy and Urinary Reduction Efforts trial. The participants' assessments of overall improvement and rating of treatment success were compared between surgical success and failure for each of the definitions studied. The Wilcoxon rank sum test was used to identify significant differences in outcomes between success and failure. RESULTS: Treatment success varied widely depending on definition used (19.2-97.2%). Approximately 71% of the participants considered their surgery "very successful," and 85.2% considered themselves "much better" than before surgery. Definitions of success requiring all anatomic support to be proximal to the hymen had the lowest treatment success (19.2-57.6%). Approximately 94% achieved surgical success when it was defined as the absence of prolapse beyond the hymen. Subjective cure (absence of bulge symptoms) occurred in 92.1% while absence of re-treatment occurred in 97.2% of participants. Subjective cure was associated with significant improvements in the patient's assessment of both treatment success and overall improvement, more so than any other definition considered (P<.001 and <.001, respectively). Similarly, the greatest difference in symptom burden and health-related quality of life as measured by the Pelvic Organ Prolapse Distress Inventory and Pelvic Organ Prolapse Impact Questionnaire scores between treatment successes and failures was noted when success was defined as subjective cure (P<.001). CONCLUSION: The definition of success substantially affects treatment success rates after pelvic organ prolapse surgery. The absence of vaginal bulge symptoms postoperatively has a significant relationship with a patient's assessment of overall improvement, while anatomic success alone does not. LEVEL OF EVIDENCE: II.
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
There is a consensus that the absence of vaginal bulge symptoms should be included in the definition of composite success, since this absence has a strong relationship with patients' assessment of overall improvement.
“Despite the lack of an internationally accepted definition, there is nowadays a consensus that the absence of vaginal bulge symptoms should be included in the definition of composite success, since this absence has a strong relationship with patients’ assessment of overall improvement [15].”
From The External Validation of a Multivariable Prediction Model for Recurrent Pelvic Organ Prolapse After Native Tissue Repair: A Prospective Cohort Study (2025) · cites this paper as [15]
The Results and Discussion report a strong relationship between absence of vaginal bulge symptoms and patients’ assessment of overall improvement, and recommend including symptom absence in a definition of success. The Discussion calls this an argument for a future consensus definition; it does not establish that a consensus already exists. Page numbers are not provided in our copy. (LLM, conf=0.85)
Experimental — accuracy not yet measuredOutcome definitions focused on apical support tend to correlate better with subjective cure.
“outcome definitions focused on apical support tend to correlate better with subjective cure.38”
From Hysterectomy versus uterine preservation for pelvic organ prolapse surgery: a prospective cohort study (2025) · cites this paper as [38]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Cites
The standardization of terminology of female pelvic organ prolapse and pelvic floor dysfunction
Bump, R. C., Mattiasson, A., Bø, K., Brubaker, L. P., DeLancey, J. O. L., Klarskov, P., Shull, B. L., & Smith, A. R. B. (1996) · American Journal of Obstetrics and Gynecology · doi:10.1016/s0002-9378(96)70243-0 · Cited by 4,275 · see citing works
Self-citationBarber, M. D., Walters, M. D., & Bump, R. C. (2005) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2004.12.025 · Cited by 1,357 · see citing works
Self-citationSurgical management of pelvic organ prolapse in women
Maher, C., Feiner, B., Baeßler, K., & Glazener, C. M. A. (2010) · Cochrane Database of Systematic Reviews · doi:10.1002/14651858.cd004014.pub4 · Cited by 1,120 · see citing works
Abdominal Sacrocolpopexy: A Comprehensive Review
Nygaard, I., McCrery, R. J., Brubaker, L. T., Connolly, A., Cundiff, G. W., Weber, A. M., & Zyczynski, H. M. (2004) · Obstetrics and Gynecology · doi:10.1097/01.aog.0000139514.90897.07 · Cited by 911 · see citing works
Self-citationSwift, S., Woodman, P., O'Boyle, A., Kahn, M., Valley, M., Bland, D., Wang, W., & Schaffer, J. (2005) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2004.10.602 · Cited by 752 · see citing works
Self-citationSamuelsson, E. C., Víctor, F.-V., Tibblin, G., & Svärdsudd, K. (1999) · American Journal of Obstetrics and Gynecology · doi:10.1016/s0002-9378(99)70203-6 · Cited by 699 · see citing works
Barber, M. D., Kuchibhatla, M. N., Pieper, C. F., & Bump, R. C. (2001) · American Journal of Obstetrics and Gynecology · doi:10.1067/mob.2001.118659 · Cited by 617 · see citing works
Self-citationBenson, J. T., Lucente, V. R., & McClellan, E. (1996) · American Journal of Obstetrics and Gynecology · doi:10.1016/s0002-9378(96)70084-4 · Cited by 574 · see citing works
Correlation of symptoms with location and severity of pelvic organ prolapse
Ellerkmann, R. M., Cundiff, G. W., Melick, C. F., Nihira, M. A., Leffler, K. S., & Bent, A. E. (2001) · American Journal of Obstetrics and Gynecology · doi:10.1067/mob.2001.119078 · Cited by 570 · see citing works
Anterior colporrhaphy: A randomized trial of three surgical techniques
Weber, A. M., Walters, M. D., PIEDMONTE, M. R., & Ballard, L. A. (2001) · American Journal of Obstetrics and Gynecology · doi:10.1067/mob.2001.119081 · Cited by 560 · see citing works
Abdominal Sacrocolpopexy with Burch Colposuspension to Reduce Urinary Stress Incontinence
Brubaker, L. T., Cundiff, G. W., Fine, P. M., Nygaard, I., Richter, H. E., Visco, A. G., Zyczynski, H. M., Brown, M. B., & Weber, A. M. (2006) · New England Journal of Medicine · doi:10.1056/nejmoa054208 · Cited by 510 · see citing works
Self-citationMaher, C., Qatawneh, A. M., DWYER, P. L., Carey, M., Cornish, A., & Schlüter, P. J. (2004) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2003.08.031 · Cited by 506 · see citing works
Swift, S., Tate, S. B., & Nicholas, J. S. (2003) · American Journal of Obstetrics and Gynecology · doi:10.1067/s0002-9378(03)00698-7 · Cited by 383 · see citing works
The Standardization of Terminology for Researchers in Female Pelvic Floor Disorders
Weber, A., Abrams, P., Brubaker, L. T., Cundiff, G. W., Davis, G., Dmochowski, R. R., Fischer, J. R., Hull, T. L., Nygaard, I., & Weidner, A. C. (2001) · International Urogynecology Journal · doi:10.1007/pl00004033 · Cited by 372 · see citing works
Self-citationRectocele repair: A randomized trial of three surgical techniques including graft augmentation
Paraiso, M. F. R., Barber, M. D., Muir, T. W., & Walters, M. D. (2006) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2006.07.026 · Cited by 360 · see citing works
Self-citationGenesis of the Vaginal Profile: A Correlated Classification of Vaginal Relaxation
Baden, W. F., & WALKED, T. A. (1972) · Clinical Obstetrics & Gynecology · doi:10.1097/00003081-197212000-00020 · Cited by 334 · see citing works
Digesu, G. A., Khullar, V., Cardozo, L., Robinson, D., & Salvatore, S. (2004) · International Urogynecology Journal · doi:10.1007/s00192-004-1225-x · Cited by 276 · see citing works
Barber, M. D., Visco, A. G., Weidner, A. C., Amundsen, C. L., & Bump, R. C. (2000) · American Journal of Obstetrics and Gynecology · doi:10.1067/mob.2000.111298 · Cited by 268 · see citing works
Self-citationLow-Weight Polypropylene Mesh for Anterior Vaginal Wall Prolapse
Hiltunen, R., Nieminen, K., Takala, T., Heiskanen, E., Merikari, M., Niemi, K., & Heinonen, P. K. (2007) · Obstetrics and Gynecology · doi:10.1097/01.aog.0000261899.87638.0a · Cited by 268 · see citing works
Paraiso, M. F. R., Ballard, L. A., Walters, M. D., Lee, J. C., & Mitchinson, A. R. (1996) · American Journal of Obstetrics and Gynecology · doi:10.1016/s0002-9378(96)70085-6 · Cited by 235 · see citing works
Development and psychometric evaluation of the ICIQ Vaginal Symptoms Questionnaire: the ICIQ‐VS
Price, N., Jackson, S., AVERY, K. N. L., Brookes, S., & Abrams, P. (2006) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.2006.00938.x · Cited by 212 · see citing works
Surgical management of pelvic organ prolapse in women
Maher, C., Carey, M., Adams, E. J., & Hagen, S. (2003) · Cochrane Database of Systematic Reviews · doi:10.1002/14651858.cd004014 · Cited by 203 · see citing works
Vaginal Wall Descensus and Pelvic Floor Symptoms in Older Women
Bradley, C. S., & Nygaard, I. (2005) · Obstetrics and Gynecology · doi:10.1097/01.aog.0000180183.03897.72 · Cited by 158 · see citing works
Self-citationPredictive value of prolapse symptoms: a large database study
Tan, J. S., Lukacz, E. S., Menefee, S. A., Powell, C. R., & Nager, C. W. (2004) · International Urogynecology Journal · doi:10.1007/s00192-004-1243-8 · Cited by 150 · see citing works
Symptoms and Outcome Measures of Pelvic Organ Prolapse
Barber, M. D. (2005) · Clinical Obstetrics & Gynecology · doi:10.1097/01.grf.0000170424.11993.73 · Cited by 118 · see citing works
Self-citationLo, T., & Wang, A. C. (1998) · Journal of Gynecologic Surgery · doi:10.1089/gyn.1998.14.59 · Cited by 114 · see citing works
A randomized trial of colpopexy and urinary reduction efforts (CARE): design and methods
Brubaker, L. T., Cundiff, G. W., Fine, P. M., Nygaard, I., Richter, H. E., Visco, A. G., Zyczynski, H. M., Brown, M. B., & Weber, A. M. (2003) · Controlled Clinical Trials · doi:10.1016/s0197-2456(03)00073-4 · Cited by 108 · see citing works
Self-citationSurgical management of pelvic organ prolapse in women
Maher, C., Baeßler, K., Glazener, C., Adams, E., & Hagen, S. (2004) · Cochrane Database of Systematic Reviews · doi:10.1002/14651858.cd004014.pub2 · Cited by 86 · see citing works
Trials of surgery for stress incontinence—thoughts on the 'Humpty Dumpty principle'
Hilton, P. (2002) · BJOG An International Journal of Obstetrics & Gynaecology · doi:10.1111/j.1471-0528.2002.02011.x · Cited by 75 · see citing works
Surgery for Pelvic Organ Prolapse
Karram, M. M., & MAHER, C. F. (2012) · Elsevier eBooks · doi:10.1016/b978-1-4160-6266-0.00011-3 · Cited by 63 · see citing works
Barber, M. D., Brubaker, L. T., Menefee, S. A., Norton, P., Borello‐France, D., Varner, E. R., Schaffer, J. I., Weidner, A. C., Xu, X. J., Spino, C., et al. (2008) · Contemporary Clinical Trials · doi:10.1016/j.cct.2008.12.001 · Cited by 57 · see citing works
Self-citation
Flagged first, then by citations
Cited by
Sorted by citations
Epidemiology and outcome assessment of pelvic organ prolapse
Barber, M. D., & Maher, C. (2013) · International Urogynecology Journal · doi:10.1007/s00192-013-2169-9 · Cited by 767 · see citing works
Self-citationLong-term Outcomes Following Abdominal Sacrocolpopexy for Pelvic Organ Prolapse
Nygaard, I., Brubaker, L., Zyczynski, H. M., Cundiff, G., Richter, H., Gantz, M., Fine, P., Menefee, S., Ridgeway, B., Visco, A., et al. (2013) · JAMA · doi:10.1001/jama.2013.4919 · Cited by 563 · see citing works
Self-citationHaylen, B. T., Maher, C. F., Barber, M. D., Camargo, S., Dandolu, V., Digesu, A., Goldman, H. B., Huser, M., Milani, A. L., Moran, P. A., et al. (2016) · International Urogynecology Journal · doi:10.1007/s00192-015-2932-1 · Cited by 461 · see citing works
Self-citationGlazener, C. M., Breeman, S., Elders, A., Hemming, C., Cooper, K. G., Freeman, R. M., Smith, A. R., Reid, F., Hagen, S., Montgomery, I., et al. (2017) · The Lancet · doi:10.1016/s0140-6736(16)31596-3 · Cited by 259 · see citing works
Jelovsek, J. E., Barber, M. D., Brubaker, L., Norton, P., Gantz, M., Richter, H. E., Weidner, A., Menefee, S., Schaffer, J., Pugh, N., et al. (2018) · JAMA · doi:10.1001/jama.2018.2827 · Cited by 256 · see citing works
Self-citationSchulten, S. F. M., Detollenaere, R. J., Stekelenburg, J., IntHout, J., Kluivers, K. B., & van Eijndhoven, H. W. F. (2019) · BMJ · doi:10.1136/bmj.l5149 · Cited by 127 · see citing works
Coolen, A.-L. W. M., van Oudheusden, A. M. J., Mol, B. W. J., van Eijndhoven, H. W. F., Roovers, J.-P. W. R., & Bongers, M. Y. (2017) · International Urogynecology Journal · doi:10.1007/s00192-017-3296-5 · Cited by 118 · see citing works
The treatment of post-hysterectomy vaginal vault prolapse: a systematic review and meta-analysis
Coolen, A.-L. W. M., Bui, B. N., Dietz, V., Wang, R., van Montfoort, A. P. A., Mol, B. W. J., Roovers, J.-P. W. R., & Bongers, M. Y. (2017) · International Urogynecology Journal · doi:10.1007/s00192-017-3493-2 · Cited by 80 · see citing works
Toozs‐Hobson, P., Freeman, R., Barber, M., Maher, C., Haylen, B., Athanasiou, S., Swift, S., Whitmore, K., Ghoniem, G., & de Ridder, D. (2012) · Neurourology and Urodynamics · doi:10.1002/nau.22238 · Cited by 70 · see citing works
Self-citationGracia, M., Perelló, M., Bataller, E., Espuña, M., Parellada, M., Genís, D., Balasch, J., & Carmona, F. (2015) · Neurourology and Urodynamics · doi:10.1002/nau.22641 · Cited by 54 · see citing works
van IJsselmuiden, M., van Oudheusden, A., Veen, J., van de Pol, G., Vollebregt, A., Radder, C., Housmans, S., van Kuijk, S., Deprest, J., Bongers, M., et al. (2020) · BJOG: An International Journal of Obstetrics & Gynaecology · doi:10.1111/1471-0528.16242 · Cited by 47 · see citing works
Mueller, M. G., Lewicky-Gaupp, C., Collins, S. A., Abernethy, M. G., Alverdy, A., & Kenton, K. (2017) · Obstetrics & Gynecology · doi:10.1097/aog.0000000000001924 · Cited by 46 · see citing works
Culligan, P. J., Salamon, C., Priestley, J. L., & Shariati, A. (2013) · Obstetrics & Gynecology · doi:10.1097/aog.0b013e31827558dc · Cited by 44 · see citing works
Jelovsek, J. E., Chagin, K., Lukacz, E. S., Nolen, T. L., Shepherd, J. P., Barber, M. D., Sung, V., Brubaker, L., Norton, P. A., Rahn, D. D., et al. (2018) · Obstetrics & Gynecology · doi:10.1097/aog.0000000000002750 · Cited by 36 · see citing works
Self-citationSurgical interventions for uterine prolapse and for vault prolapse: the two VUE RCTs
Hemming, C., Constable, L., Goulao, B., Kilonzo, M., Boyers, D., Elders, A., Cooper, K., Smith, A., Freeman, R., Breeman, S., et al. (2020) · Health Technology Assessment · doi:10.3310/hta24130 · Cited by 35 · see citing works
Glazener, C., Breeman, S., Elders, A., Hemming, C., Cooper, K., Freeman, R., Smith, A., Hagen, S., Montgomery, I., Kilonzo, M., et al. (2016) · Health Technology Assessment · doi:10.3310/hta20950 · Cited by 35 · see citing works
Erekson, E., Murchison, R. L., Gerjevic, K. A., Meljen, V. T., & Strohbehn, K. (2017) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2017.05.052 · Cited by 34 · see citing works
Systematic review of definitions for success in pelvic organ prolapse surgery
Kowalski, J. T., Mehr, A., Cohen, E., & Bradley, C. S. (2018) · International Urogynecology Journal · doi:10.1007/s00192-018-3755-7 · Cited by 31 · see citing works
Between hope and fear: patient’s expectations prior to pelvic organ prolapse surgery
Lawndy, S. S. S., Withagen, M. I., Kluivers, K. B., & Vierhout, M. E. (2011) · International Urogynecology Journal · doi:10.1007/s00192-011-1448-6 · Cited by 28 · see citing works
Jelovsek, J. E., Gantz, M. G., Lukacz, E., Sridhar, A., Zyczynski, H., Harvie, H. S., Dunivan, G., Schaffer, J., Sung, V., Varner, R. E., et al. (2021) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2020.10.009 · Cited by 28 · see citing works
Self-citationFarthmann, J., Watermann, D., Erbes, T., Roth, K., Nanovska, P., Gitsch, G., & Gabriel, B. (2015) · Archives of Gynecology and Obstetrics · doi:10.1007/s00404-014-3435-x · Cited by 25 · see citing works
Sacrocolpopexy compared with transvaginal mesh surgery: A systematic review and meta-analysis
Zhang, C., Sun, Z., Yang, J., Xu, T., Zhu, L., & Lang, J. (2021) · BJOG: An International Journal of Obstetrics & Gynaecology · doi:10.1111/1471-0528.16324 · Cited by 26 · see citing works
Jelovsek, J. E., Gantz, M. G., Lukacz, E. S., Zyczynski, H. M., Sridhar, A., Kery, C., Chew, R., Harvie, H. S., Dunivan, G., Schaffer, J., et al. (2021) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2021.06.068 · Cited by 20 · see citing works
Self-citationBrennand, E. A., Scime, N. V., Huang, B., Edwards, A. D., Kim-Fine, S., Hall, J., Birch, C., Robert, M., & Carter Ramirez, A. (2025) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2024.10.021 · Cited by 18 · see citing works
Long-term outcomes and predictors of failure after surgery for stage IV apical pelvic organ prolapse
Linder, B. J., El-Nashar, S. A., Mukwege, A. A., Weaver, A. L., McGree, M. E., Rhodes, D. J., Gebhart, J. B., Klingele, C. J., Occhino, J. A., & Trabuco, E. C. (2018) · International Urogynecology Journal · doi:10.1007/s00192-017-3482-5 · Cited by 14 · see citing works
Impact of levator muscle avulsions on Manchester procedure outcomes in pelvic organ prolapse surgery
Oversand, S. H., Staff, A. C., Volløyhaug, I., & Svenningsen, R. (2019) · Acta Obstetricia et Gynecologica Scandinavica · doi:10.1111/aogs.13604 · Cited by 13 · see citing works
Arcieri, M., Morlacco, A., Montebelli, F., Mancini, M., Soligo, M., Restaino, S., Driul, L., Campagna, G., Panico, G., Ercoli, A., et al. (2023) · International Journal of Gynecology & Obstetrics · doi:10.1002/ijgo.14959 · Cited by 11 · see citing works
Pelvic floor muscle weakness: a risk factor for anterior vaginal wall prolapse recurrence
Schachar, J. S., Devakumar, H., Martin, L., Farag, S., Hurtado, E. A., & Davila, G. W. (2018) · International Urogynecology Journal · doi:10.1007/s00192-018-3626-2 · Cited by 9 · see citing works
Kearney, R., Wagg, A., Bower, W., Chapple, C., Khullar, V., Robinson, D., Taithongchai, A., Hobson, P. T., Wein, A., & Abrams, P. (2026) · Neurourology and Urodynamics · doi:10.1002/nau.70272 · Cited by 1 · see citing works
Kessels, I., van Kuijk, S., Vergeldt, T., van Gestel, I., Spaans, W., Notten, K., Kruitwagen, R., & Weemhoff, M. (2025) · Journal of Clinical Medicine · doi:10.3390/jcm14020531
Erekson, E., Menefee, S. A., Whitworth, R., Gizlice, S., Zyczynski, H. M., Rahn, D. D., Amundsen, C. L., Sung, V. W., Arya, L. A., Ferrando, C. A., et al. (2026) · American Journal of Obstetrics and Gynecology · doi:10.1016/j.ajog.2025.11.002
- Authors
- Barber, M. D., Brubaker, L., Nygaard, I., Wheeler, T. L., Schaffer, J., Chen, Z., & Spino, C.
- Affiliations
- Cleveland Clinic (US)
- Loyola University Chicago (US)
- University of Utah (US)
- University of Alabama at Birmingham (US)
- Venue
- Obstetrics & Gynecology
- Published
- 2009-09
- Volume
- 114
- Issue
- 3
- Pages
- 600-609
- ISSN
- 0029-7844 (ISSN-L)
- PMC
- PMC2904469
- OpenAlex
- W2070502906
- Cited by
- 515
- References
- 31
- Citations by year
- 2026: 24 · 2025: 19 · 2024: 25 · 2023: 34 · 2022: 27 · 2021: 34 · 2020: 38 · 2019: 37 · 2018: 38 · 2017: 32 · 2016: 33 · 2015: 23 · 2014: 27 · 2013: 36 · 2012: 37
- FWCI
- 20.58
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Obstetrics and Gynecology (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- Eunice Kennedy Shriver National Institute of Child Health and Human Development (U10 HD 54215, U10 HD54241, U10 HD41267, U10 HD41261, U10HD041268, U01-HD41249, U10 HD 54214, U10HD041261, U10HD054136, U10HD054214, U10 HD 41250, U01HD041249, U10HD054215, U10HD041263, U10 HD 54136, U10HD041267, U10HD054241, U10HD041248, U10HD041269, U10HD041250, UG1HD041267)
- Topics
- Health Sciences › Medicine › Rheumatology › Pelvic floor disorders treatments
- Health Sciences › Medicine › Obstetrics and Gynecology › Uterine Myomas and Treatments
- Health Sciences › Medicine › Surgery › Hernia repair and management
- Keywords
- pelvic organ prolapse, sacrocolpopexy, anatomical success, retreatment, patient-reported outcomes, health-related quality of life
- MeSH terms
- Adult, Female, Follow-Up Studies, Humans, Quality of Life, Surgical Mesh, Uterine Prolapse, Visceral Prolapse, Patient Satisfaction, Outcome Assessment, Health Care, Pelvic Floor, Retreatment
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review