| The effect of activity-based financing on hospital efficiency: a panel data analysis of DEA efficiency scores 1992–2000 E Biørn, TP Hagen, T Iversen, J Magnussen Health care management science 6, 271-283, 2003 | 350 | 2003 |
| The Norwegian hospital reform of 2002: central government takes over ownership of public hospitals TP Hagen, OM Kaarbøe Health policy 76 (3), 320-333, 2006 | 175 | 2006 |
| Political characteristics, institutional procedures and fiscal performance: Panel data analyses of Norwegian local governments, 1991–1998 TP Hagen, SI Vabo European Journal of Political Research 44 (1), 43-64, 2005 | 165 | 2005 |
| Kommunal organisering: effektivitet, styring og demokrati TP Hagen, RJ Sørensen Universitetsforl., 2006 | 157* | 2006 |
| Centralized or decentralized? A case study of Norwegian hospital reform J Magnussen, TP Hagen, OM Kaarboe Social science & medicine 64 (10), 2129-2137, 2007 | 148 | 2007 |
| Sex-based differences in premature first myocardial infarction caused by smoking: twice as many years lost by women as by men M Grundtvig, TP Hagen, M German, Å Reikvam European Journal of Preventive Cardiology 16 (2), 174-179, 2009 | 123 | 2009 |
| Cost of extracorporeal membrane oxygenation: evidence from the Rikshospitalet University Hospital, Oslo, Norway V Mishra, JL Svennevig, JF Bugge, S Andresen, A Mathisen, H Karlsen, ... European journal of cardio-thoracic surgery 37 (2), 339-342, 2010 | 109 | 2010 |
| Do hospital mergers increase hospital efficiency? Evidence from a National Health Service country L Kjekshus, T Hagen Journal of health services research & policy 12 (4), 230-235, 2007 | 105 | 2007 |
| Health care priority setting in Norway a multicriteria decision analysis T Defechereux, F Paolucci, A Mirelman, S Youngkong, G Botten, ... BMC health services research 12, 1-7, 2012 | 104 | 2012 |
| Trends and variation in mild disability and functional limitations among older adults in Norway, 1986–2008 JO Moe, TP Hagen European journal of ageing 8, 49-61, 2011 | 88 | 2011 |
| Excess all-cause mortality and COVID-19-related mortality: a temporal analysis in 22 countries, from January until August 2020 S Achilleos, A Quattrocchi, J Gabel, A Heraclides, O Kolokotroni, ... International journal of epidemiology 51 (1), 35-53, 2022 | 71 | 2022 |
| How different are hospitals’ responses to a financial reform? The impact on efficiency of activity-based financing E Biørn, TP Hagen, T Iversen, J Magnussen Health care management science 13, 1-16, 2010 | 61 | 2010 |
| Reimbursement systems, organisational forms and patient selection: evidence from day surgery in Norway PE Martinussen, TP Hagen Health Economics, Policy and Law 4 (2), 139-158, 2009 | 61 | 2009 |
| The Norwegian health care system P Van den Noord, T Hagen, T Iversen OECD, 1998 | 61 | 1998 |
| Assessing physician productivity following Norwegian hospital reform: A panel and data envelopment analysis KA Johannessen, SAC Kittelsen, TP Hagen Social Science & Medicine 175, 117-126, 2017 | 59 | 2017 |
| Deficits, soft budget constraints and bailouts: Budgeting after the Norwegian hospital reform T Tjerbo, TP Hagen Scandinavian Political Studies 32 (3), 337-358, 2009 | 59 | 2009 |
| Are waiting times for hospital admissions affected by patients' choices and mobility? Å Ringard, TP Hagen BMC health services research 11, 1-9, 2011 | 56 | 2011 |
| Continuity of care and its effect on readmissions for COPD patients: a comparative study of Norway and Germany JO Swanson, V Vogt, L Sundmacher, TP Hagen, TA Moger Health Policy 122 (7), 737-745, 2018 | 55 | 2018 |
| Physicians’ engagement in dual practices and the effects on labor supply in public hospitals: results from a register-based study KA Johannessen, TP Hagen BMC health services research 14, 1-11, 2014 | 53 | 2014 |
| Agenda setting power and moral hazard in principal-agent relationships: Evidence from hospital budgeting in Norway TP Hagen European journal of political research 31 (3), 287-314, 1997 | 50 | 1997 |
Tor IversenProfessor of health economics at the University of OsloVerified email at medisin.uio.no
