• 1
    World Health Organization, UNICEF, UNFPA and the World Bank. Trends in Maternal Mortality: 1990 to 2010. Geneva: World Health Organization, 2012 [World Health Organization website:]. Accessed 12 June 2013.
  • 2
    Khan KS, Wojdyla D, Say L, Gulmezoglu AM, Van Look PF. WHO analysis of causes of maternal death: a systematic review. Lancet 2006;367:106674.
  • 3
    National High Blood Pressure Education Program Working Group on High Blood Pressure in Pregnancy. Report of the national high blood pressure education program working group on high blood pressure in pregnancy. Am J Obstet Gynecol 2000;183:S122.
  • 4
    Abalos E, Cuesta C, Grosso AL, Chou D, Say L. Global and regional estimates of preeclampsia and eclampsia: a systematic review. Eur J Obstet Gynecol Reprod Biol 2013;170:17.
  • 5
    Health Canada. Special Report on Maternal Mortality and Severe Morbidity in Canada – Enhanced Surveillance: the Path to Prevention. Ottawa: Minister of Public Works and Government Services Canada, 2004.
  • 6
    Pattinson R. Near miss audit in obstetrics. Best Pract Res Clin Obstet Gynaecol 2009;23:2856.
  • 7
    Say L, Souza JP, Pattinson RC, WHO Working Group on Maternal Mortality and Morbidity Classifications. Maternal near miss – towards a standard tool for monitoring quality of maternal health care. Best Pract Res Clin Obstet Gynaecol 2009;23:28796.
  • 8
    Say L, Pattinson RC, Gülmezoglu AM. WHO systematic review of maternal morbidity and mortality: the prevalence of severe acute maternal morbidity (near miss). Reprod Health 2004;1:3.
  • 9
    Souza JP, Gülmezoglu AM, Vogel J, Carroli G, Lumbiganon P, et al. Moving beyond essential interventions for reduction of maternal mortality (the WHO Multicountry Survey on Maternal and Newborn Health): a cross-sectional study. Lancet 2013;381:174755.
  • 10
    Souza JP, Gülmezoglu AM, Carroli G, Lumbiganon P, Qureshi Z, WHOMCS Research Group. The World Health Organization multicountry survey on maternal and newborn health: study protocol. BMC Health Serv Res 2011;11:286.
  • 11
    Shah A, Faundes A, Machoki M, Bataglia V, Amokrane F, Donner A, et al. Methodological considerations in implementing the WHO Global Survey for Monitoring Maternal and Perinatal Health. Bull World Health Organ 2008;86:12631.
  • 12
    Donner A, Klar N. Methods for comparing event rates in intervention studies when the unit of allocation is a cluster. Am J Epidemiol 1994;140:27989.
  • 13
    Littell RC, et al. SAS for Mixed Models, 2nd edn. Cary, NC: SAS Institute; 2010.
  • 14
    The World Bank. The Complete World Development Report Online. 2013. []. Accessed 3 June 2013.
  • 15
    Roberts CL, Bell JC, Ford JB, et al. The accuracy of reporting of the hypertensive disorders of pregnancy in population health data. Hypertens Pregnancy 2008;27:28597.
  • 16
    Lawler J, Osman M, Shelton JA, et al. Population-based analysis of hypertensive disorders in pregnancy. Hypertens Pregnancy 2007;26:6776.
  • 17
    Alves E, Azevedo A, Rodrigues T, Santos AC, Barros H. Impact of risk factors on hypertensive disorders in pregnancy, in primiparae and multiparae. Ann Hum Biol 2013;40:37784.
  • 18
    Duckitt K, Harrington D. Risk factors for pre-eclampsia at antenatal booking: a systematic review of controlled studies. BMJ 2005;330:5657.
  • 19
    Schneider S, Freerksen N, Maul H, Roehrig S, Fischer B, Hoeft B. Risk groups and maternal–neonatal complications of preeclampsia – current results from the national German Perinatal Quality Registry. J Perinat Med 2011;39:25765.
  • 20
    de Vienne CM, Creveuil C, Dreyfus M. Does young maternal age increase the risk of adverse obstetric, fetal and neonatal outcomes: a cohort study. Eur J Obstet Gynecol Reprod Biol 2009;147:1516.
  • 21
    Aliyu MH, Luke S, Kristensen S, Alio AP, Salihu HM. Joint effect of obesity and teenage pregnancy on the risk of preeclampsia: a population-based study. J Adolesc Health 2010;46:7782.
  • 22
    Milne F, Redman C, Walker J, Baker P, Bradley J, Cooper C, et al. The pre-eclampsia community guideline (PRECOG): how to screen for and detect onset of pre-eclampsia in the community. BMJ 2005;330:57680.
  • 23
    Nevis IF, Reitsma A, Dominic A, McDonald S, Thabane L, Akl EA, et al. Pregnancy outcomes in women with chronic kidney disease: a systematic review. Clin J Am Soc Nephrol 2011;6:258798.
  • 24
    Sibai BM. Chronic hypertension in pregnancy. Obstet Gynecol 2002;100:36977.
  • 25
    Visintin C, Mugglestone MA, Almerie MQ, Nherera LM, James D, Walkinshaw S, Guideline Development Group. Management of hypertensive disorders during pregnancy: summary of NICE guidance. BMJ 2010;341:c2207.
  • 26
    Conde-Agudelo A, Villar J, Lindheimer M. Maternal infection and risk of preeclampsia: systematic review and metaanalysis. Am J Obstet Gynecol 2008;198:722.
  • 27
    Minassian C, Thomas SL, Williams DJ, Campbell O, Smeeth L. Acute maternal infection and risk of pre-eclampsia: a population-based case–control study. PLoS ONE 2013;8:e73047.
  • 28
    Ali AA, Rayis DA, Abdallah TM, Elbashir MI, Adam I. Severe anaemia is associated with a higher risk for preeclampsia and poor perinatal outcomes in Kassala hospital, eastern Sudan. BMC Res Notes 2011;4:311.
  • 29
    Peña-Rosas JP, De-Regil LM, Dowswell T, Viteri FE. Daily oral iron supplementation during pregnancy. Cochrane Database Syst Rev 2012;12:CD004736.
  • 30
    Karumanchi SA, Lindheimer MD. Advances in the understanding of eclampsia. Curr Hypertens Rep 2008;10:30512.
  • 31
    Rattray DD, O'Connell CM, Baskett TF. Acute disseminated intravascular coagulation in obstetrics: a tertiary centre population review (1980 to 2009). J Obstet Gynaecol Can 2012;34:3417.
  • 32
    von Dadelszen P, Magee LA, Devarakonda RM, Hamilton T, Ainsworth LM, Yin R, et al. The prediction of adverse maternal outcomes in preeclampsia. J Obstet Gynaecol Can 2004;26:8719.
  • 33
    Laskin S, Payne B, Hutcheon JA, Qu Z, Douglas MJ, Ford J, et al. The role of platelet counts in the assessment of inpatient women with preeclampsia. J Obstet Gynaecol Can 2011;33:9008.
  • 34
    Levy JA, Murphy LD. Thrombocytopenia in pregnancy. J Am Board Fam Pract 2002;15:2907.
  • 35
    Myers B. Diagnosis and management of maternal thrombocytopenia in pregnancy. Br J Haematol 2012;158:3.
  • 36
    Thangaratinam S, Koopmans CM, Iyengar S, Zamora J, Ismail KM, Mol BW, et al. Accuracy of liver function tests for predicting adverse maternal and fetal outcomes in women with preeclampsia: a systematic review. Acta Obstet Gynecol Scand 2011;90:57485.
  • 37
    Dennis AT, Solnordal CB. Acute pulmonary oedema in pregnant women. Anaesthesia 2012;67:64659.
  • 38
    von Dadelszen P, Payne B, Li J, Ansermino JM, Broughton Pipkin F, Côté AM, et al. Prediction of adverse maternal outcomes in pre-eclampsia: development and validation of the fullPIERS model. Lancet 2011;377:21927.
  • 39
    Payne B, Hodgson S, Hutcheon JA, Joseph KS, Li J, Lee T, et al. Performance of the fullPIERS model in predicting adverse maternal outcomes in pre-eclampsia using patient data from the PIERS (Pre-eclampsia Integrated Estimate of RiSk) cohort, collected on admission. BJOG 2013;120:11318.