Quality Ratings of Cohort Studies

Study, YearAssembly of GroupsMaintenance of comparable groupsOutcome measures reliable & validOutcome assessor blind to exposure statusMissing dataFollow-up long enough for outcomes to occurConsider/adjust for potential confounders (obstetric conditions)Quality Score
Amir, 19875YesYesUnclearUnclearNoneYesYes/NoFair
Asakura, 19956UnclearUnclearUnclearNoUnclearYesNo/NoPoor*
Bahtiyar, 20067YesYesNoNoUnclearYesYes/YesFair
Bais, 20018YesUnclearYesYesNoYesYes/NoFair
Bashiri, 20089YesNoYesYesNoYesYes/YesGood
Blanchette, 199910YesUnclearUnclearNot reportedNot reportedYesNo/NoPoor*
Blanchette, 200111UnclearNoNoUnclearUnclearYesYes/Yes for uterine rupture, no for all othersPoor*
Bujold, 200212YesNoUnclearUnclearUnclearYesYes/YesFair
Bujold, 200213YesYesYesNoNoYesYes/YesGood
Bujold, 200414YesYesUnclearNoNoYesYes/YesFair
Bujold, 200415YesYesUnclearNoNoYesYes/YesFair
Bujold, 200516YesYesYesNot reportedNoYesYes/YesGood
Cahill, 200617YesNoYesYesNoYesYes/YesFair
Carroll, 200318YesUnclearUnclearUnclearUnclearYesYes/YesFair
Caughey, 199919YesYesUnclearUnclear<20%YesYes/YesFair
Chang, 200820YesYesYesNoNoneYesYes/YesGood
Chapman, 199721YesNoUnclearUnclearUnclearYesNo/NoPoor*
Chauhan, 200122YesNoYesUnclearNoYesYes/SomeFair
Chauhan, 200223YesUnclearUnclearNoLow, 1/156YesYes/YesFair
Chestnut, 198524UnclearYesUnclearNoMaternal morbidity for post-op: 25%; Other outcomes: 0% for other outcomesYesSome/NoPoor*
Coughlan, 200225YesNoYesUnclearUnclearYesNo/NoPoor*
DeFranco, 200726YesYesYesNoNoneYesYes/YesGood
Delaney, 200327YesYesYesUnclearNoneYesYes/NoFair
Dhall, 198728YesUnclearUnclearUnclearNot reportedYesYes/YesPoor*
DiMaio, 200229YesNoYesUnclearNot applicableYesNoFair
Dinsmoor, 200430YesNoYesYesLow, 12%YesYes/YesFair
Duff, 198831YesUnclearYesUnclearUnclearYesNo/NoPoor*
Durnwald, 200432UnclearUnclearYesUnclearUnclearYesYes/YesFair
Durnwald, 200433YesYesNoNoNoYesNo/NoFair
Edwards, 200334YesUnclearNoNoNoYesYes/NoPoor*
Eglinton, 198435YesUnclearYesUnclearLow, 5%YesYes/YesFair
Elkousy, 200336UnclearUnclearNoUnclearUnclearYesYes/YesFair
El-Sayed, 200737UnclearNot applicableUnclearNo<20%YesYes/YesFair
Eriksen, 198938UnclearYesUnclearUnclearNoYesSome/NoFair
Fisler, 200339YesYesYesNoNoYesYes/YesFair
Flamm, 198740YesNot applicableYesNoNot applicableYesYes/YesFair
Flamm, 198941YesUnclearUnclearNoNoUnclearNo/NoPoor*
Flamm, 199442YesNot applicableYesNoNot applicableYesYes/YesGood
Flamm, 199743YesYesYesNoNot applicableYesYes/YesGood
Gemer, 199244YesUnclearYesUnclearNoYesYes/NoPoor*
Getahun, 200645UnclearUnclearUnclearUnclearUnclearYesYes/YesPoor*
Gibson, 198846UnclearUnclearUnclearNoNoneYesNo/NoFair
Gonen, 200647UnclearNoYesNoUnclearYesYes/YesFair
Gonen, 200748YesNoUnclearUnclearUnclearYesNo/NoPoor*
Goodall, 200549YesUnclearYesUnclearNoYesYes/YesFair
Granovsky- Grisaru, 199450YesUnclearUnclearUnclearNot applicableYesYes/YesFair
Gregory, 199951YesNot applicableYesNot applicableNot applicableNot applicableYes/YesGood
Gregory, 200852YesNoNoNoUnclearUnclearYes/YesFair
Grobman, 200753YesUnclearYesYesNoYesYes/YesGood
Grobman, 200854YesUnclearYesNoMissing 30% of body mass indexes, and 25% of prior birth weightsYesYes/YesGood
Grossetti, 200755UnclearYesUnclearNoNoYesUnclearFair
Hammoud, 200456YesNoUnclearUnclearUnclearYesYes/YesFair
Hansell, 199057YesYesYesYesNoYesYes/NoFair
Hashima, 200758YesNoYesYesUnclearYesYes/YesFair
Hemminki, 200559YesUnclearUnclearUnclear1.20%YesYes/YesFair
Hershkowitz, 199560YesUnclearUnclearUnclearUnclearYesYes/YesFair
Hibbard, 200161UnclearNoYesUnclearERCD: 2.4%; VBAC: 6.9%YesYes/YesFair
Hibbard, 200662YesYesYesNoNoYesYes/YesGood
Hollard, 200663YesNoYesYesNoYesYes/YesGood
Hook, 199764YesYesYesNot reportedNoYesYes/YesGood
Horenstein, 198465UnclearYesUnclearNoNoYesVery little/NoFair
Horenstein, 198566UnclearYesUnclearNoNoYesVery little/NoFair
Hoskins, 199767YesNot applicableYesUnclearNot applicableYesNoFair
Johnson, 199168YesUnclearYesNoUnclearYesNo/NoFair
Juhasz, 200569YesUnclearYesUnclearNoYesYes/YesFair
Kamath, 200970YesNoYesNoNoYesYes/YesFair
Kayani, 200571YesYesUnclearNoNoYesVery little/NoFair
Kugler, 200872UnclearNot applicableNoNoNoYesNo/NoFair
Kwee, 200773YesUnclearYesNoNoYesNo/NoFair
Landon, 200474YesNoYesNo< 20%YesYes/YesFair
Landon, 200675YesNoYesUnclear<20% - 7% (unknown intent to trial of labor)YesYes/YesFair
Lieberman, 200476YesYesUnclearNoUnclearYesYes/NoFair
Lin, 200477YesYesYesNoNoYesUnclearFair
Loebel, 200478UnclearYesUnclearNoNoYesNo/NoFair
Lydon-Rochelle, 200179YesNoUnclearUnclearNo data givenYesYes/YesFair
Lyndon-Rochelle, 200180YesNot applicableNoNoNot applicableYesYes/YesPoor*
Macones, 200581YesNot applicableYesNoNot applicableYesYes/NoFair
Martin, 198382YesNot applicableYes. No for feverNoNot applicableYesNo/NoFair
McMahon, 199683YesNot applicableYesNoNot applicableYesYes/YesGood
Melnikow, 200184YesUnclearYesYesLow, 73/1662Not applicableNot reportedFair
Miller, 199285YesNot applicableYesYesNot applicableNot applicableNo/NoPoor*
Naef, 199586YesNoYesNoUnclearYesNo/NoPoor*
Nisenblat, 200687YesNoYesNoUnclearYesYes/YesFair
Obara, 199888YesNoUnclearUnclearUnclearYesYes/NoFair
Odibo, 200789YesUnclearunclearUnclearUnclearYesYes/YesFair
Ogunyemi, 199890YesNoUnclearNot applicableNoYesNo/NoPoor*
Ouzounian, 199691UnclearYesYesNoNoYesNo/NoFair
Paterson, 199192YesYesUnclearUnclearNot applicableYesUnclearFair
Pathadey, 200593YesYesUnclearNoNoYesYes/NoFair
Paul, 198594YesNot applicableYesNoNot applicableYesYes/NoFair
Peaceman, 200695YesNoYesUnclearUnclearYesYes/YesFair
Phelan, 198796YesNot applicableYesNoNot applicableYesYes/NoFair
Phelan, 198997YesUnclearYes for uterine rupture. No for feverYesNoYesYes/NoPoor*
Pruett, 198898YesUnclearYesNoUnclearYesNo/NoPoor*
Quinones, 200599UnclearUnclearYesNolowYesYes/YesFair
Rageth, 1999100NoNot applicableNoNoNot applicableYesNo/NoPoor*
Ravasia, 2000101UnclearNoNoNoNoYesNo/NoPoor*
Raynor, 1993102YesNot applicableYesUnclearNot applicableYesNoFair
Richardson, 2005103YesUnclearYesNoNoYesYes/YesFair
Richter, 2002104YesNoYesNoNoYesSome/NoFair
Rozenberg, 1996105YesYesYesYesNoYesYes/YesGood
Rozenberg, 1999106NoYesYesNoNoYesYes/UnclearFair
Rudick, 1984107YesYesUnclearNoNoYesYes/NoFair
Russillo, 2008108YesUnclearUnclearYesNoYesYes/NoPoor*
Sakala, 1990109YesYesUnclearNoNoYesYes/NoFair
Sakala, 1990110UnclearUnclearUnclearNoNoYesNo/NoPoor*
Schneider, 1988111Inclusion criteria are described, but methods to ascertain group are not discussed. Elective repeat cesarean group includes medical and obstetric reasons as well as maternal decisions, and methods for ascertaining the reason are not describedUnclearUnclearUnclearNoYesYes/NoPoor*
Sciscione, 2008112YesNoYesYesNoYesYes/YesGood
Shipp, 2008113YesNoYesYesNoYesYes/YesFair
Smith, 2002114YesYesYesNoNoYesYes/SomeGood
Socol, 1999115YesUnclearYesUnclearNoYesNo/NoFair
Spaans, 2003116YesUnclearUnclearUnclearUnclearYesNo/NoPoor*
Spong, 2007117Yes. However, the number (39,177) for term singleton gestation with prior cesarean is different from prior publication (Landon, 2006)YesYesNoYesYesYes/YesFair
Stone, 2000118UnclearNot applicableUnclearNoNot applicableYesNo/NoPoor*
Strong, 1992119UnclearYesNoNoNoYesNo/NoPoor*
Stovall, 1987120YesNot applicableYes/YesUnclearNot applicableYesNoFair
Tahilramaney, 1984121YesYesUnclearNoNoYesYes/YesFair
Tucker, 1993122YesUnclearNoNoNoYesNo/NoPoor*
Upadhyaya, 2003123UnclearUnclearYesUnclearNot applicableYesYes/YesFair
Van der Walt, 1994124UnclearUnclearYesUnclearYesYesYes/YesFair
Van Gelderen, 1986125UnclearYesUnclearNoNoYesNo/NoFair
Videla, 1995126YesUnclearNoNoYesYesNo/NoPoor*
Weinstein, 1996127YesYesFor some, not for othersNoNot applicableYesYes/YesFair
Wen, 2004128UnclearYesUnclearNoNoYesSome/SomeFair
Yetman, 1989129YesUnclearNoYesLow, 5%YesNo/NoFair
Yogev, 2004130UnclearYesYesNoNoYesYes/YesFair
Zelop, 1999131YesYesYesNoNoYesNo/NoFair
Zelop, 2000132YesUnclearNoNoYesYesNo/NoPoor*
Zelop, 2001133YesYesYesNoNot applicableYesYes/YesFair

From: Appendix I, Individual Quality Rating Tables

Cover of Vaginal Birth After Cesarean: New Insights
Vaginal Birth After Cesarean: New Insights.
Evidence Reports/Technology Assessments, No. 191.
Guise JM, Eden K, Emeis C, et al.

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