Excluded Studies

Excluded Studies

1 study reporting similar results from the same dataset of an included previously published study [1].

1 study not ICU patients [2].

3 studies reporting data from specialized obstetric ICUs [3-5]

6 studies that did not report either the number of deliveries or ICU admissions [6-11]

1. Bouvier-Colle M-H, Varnoux N, Salanave B, Ancel P-Y, Breart G. Case-control study of risk factors for obstetric patients' admission to intensive care units. Eur J Obstet Gynecol Reprod Biol. 1997;74:173-7.

2. Brace V, Penney G, Hall M. Quantifying severe maternal morbidity: a Scottish population study. Br J Obstet Gynaecol. 2004;111:481-84.

3. Mabie WC, Sibai BM. Treatment in an obstetric intensive-care unit. Am J Obstet Gynecol. 1990;162:1-4.

4. Zeeman G. Obstetric critical care: A blueprint for improved outcomes. Crit Care Med. 2006;34:S208-S14.

5. Zeeman G, Wendel G, Cunningham F. A blueprint for obstetric critical care. Am J Obst Gynecol. 2003;188:532-6.

6. Stevens T, Carroll M, Promecene P, Seibel M, Monga M. Utility of Acute Physiology, Age, and Chronic Health Evaluation (APACHE III) score in maternal admissions to the intensive care unit. Am J Obstet Gynecol. 2006;194:el3-el5.

7. Afessa B, Green B, Delke I, Koch K. Systemic Inflammatory Response Syndrome, Organ Failure, and Outcome in Critically Ill Obstetric Patients Treated in an ICU. Chest. 2001;120:1271-7.

8. el-Solh AA, Grant BJ. A comparison of severity of illness scoring systems for critically ill obstetric patients. Chest. 1996;110:1299-304.

9. Collop NA, Sahn SA. Critical illness in pregnancy : an analysis of 20 patients admitted to a medical intensive care unit. Chest. 1993;103:1548-53.

10. Taylor R, Richards G. Critically ill obstetric and gynaecological patients in the intensive care unit. S Afr Med J. 2000;90:1140-4.

11. Heinonen S, Tyrvainen E, Saarikoski S, Ruokonen E. Need for maternal critical care in obstetrics: a population-based analysis. Int J Obst Anesth. 2002;11:260-4.