Omar RZ - Search Results

1

Estimation of required sample size for external validation of risk models for binary outcomes.

Pavlou M, Qu C, Omar RZ, Seaman SR, Steyerberg EW, White IR, Ambler G. Pavlou M, et al. Among authors: omar rz. Stat Methods Med Res. 2021 Oct;30(10):2187-2206. doi: 10.1177/09622802211007522. Epub 2021 Apr 21. Stat Methods Med Res. 2021. PMID: 33881369 Free PMC article.

2

Validation of four different risk stratification systems in patients undergoing off-pump coronary artery bypass surgery: a UK multicentre analysis of 2223 patients.

Al-Ruzzeh S, Asimakopoulos G, Ambler G, Omar R, Hasan R, Fabri B, El-Gamel A, DeSouza A, Zamvar V, Griffin S, Keenan D, Trivedi U, Pullan M, Cale A, Cowen M, Taylor K, Amrani M. Al-Ruzzeh S, et al. Heart. 2003 Apr;89(4):432-5. doi: 10.1136/heart.89.4.432. Heart. 2003. PMID: 12639875 Free PMC article.

3

An evaluation of existing risk stratification models as a tool for comparison of surgical performances for coronary artery bypass grafting between institutions.

Asimakopoulos G, Al-Ruzzeh S, Ambler G, Omar RZ, Punjabi P, Amrani M, Taylor KM. Asimakopoulos G, et al. Among authors: omar rz. Eur J Cardiothorac Surg. 2003 Jun;23(6):935-41; discussion 941-2. doi: 10.1016/s1010-7940(03)00165-9. Eur J Cardiothorac Surg. 2003. PMID: 12829069

4

Cardiac surgery risk modeling for mortality: a review of current practice and suggestions for improvement.

Omar RZ, Ambler G, Royston P, Eliahoo J, Taylor KM. Omar RZ, et al. Ann Thorac Surg. 2004 Jun;77(6):2232-7. doi: 10.1016/j.athoracsur.2003.10.032. Ann Thorac Surg. 2004. PMID: 15172320 Review.

5

Generic, simple risk stratification model for heart valve surgery.

Ambler G, Omar RZ, Royston P, Kinsman R, Keogh BE, Taylor KM. Ambler G, et al. Among authors: omar rz. Circulation. 2005 Jul 12;112(2):224-31. doi: 10.1161/CIRCULATIONAHA.104.515049. Epub 2005 Jul 5. Circulation. 2005. PMID: 15998680

6

Case-mix and variation in specialist referrals in general practice.

Sullivan CO, Omar RZ, Ambler G, Majeed A. Sullivan CO, et al. Among authors: omar rz. Br J Gen Pract. 2005 Jul;55(516):529-33. Br J Gen Pract. 2005. PMID: 16004738 Free PMC article.

7

Quality research in healthcare: are researchers getting enough statistical support?

Omar RZ, McNally N, Ambler G, Pollock AM. Omar RZ, et al. BMC Health Serv Res. 2006 Jan 12;6:2. doi: 10.1186/1472-6963-6-2. BMC Health Serv Res. 2006. PMID: 16409636 Free PMC article.

8

A comparison of imputation techniques for handling missing predictor values in a risk model with a binary outcome.

Ambler G, Omar RZ, Royston P. Ambler G, et al. Among authors: omar rz. Stat Methods Med Res. 2007 Jun;16(3):277-98. doi: 10.1177/0962280206074466. Stat Methods Med Res. 2007. PMID: 17621472

9

An evaluation of penalised survival methods for developing prognostic models with rare events.

Ambler G, Seaman S, Omar RZ. Ambler G, et al. Among authors: omar rz. Stat Med. 2012 May 20;31(11-12):1150-61. doi: 10.1002/sim.4371. Epub 2011 Oct 14. Stat Med. 2012. PMID: 21997569

10

A novel clinical risk prediction model for sudden cardiac death in hypertrophic cardiomyopathy (HCM risk-SCD).

O'Mahony C, Jichi F, Pavlou M, Monserrat L, Anastasakis A, Rapezzi C, Biagini E, Gimeno JR, Limongelli G, McKenna WJ, Omar RZ, Elliott PM; Hypertrophic Cardiomyopathy Outcomes Investigators. O'Mahony C, et al. Among authors: omar rz. Eur Heart J. 2014 Aug 7;35(30):2010-20. doi: 10.1093/eurheartj/eht439. Epub 2013 Oct 14. Eur Heart J. 2014. PMID: 24126876

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