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Table 1 Basic characteristics of included studies

From: Elevated level of nerve growth factor in the bladder pain syndrome/interstitial cystitis: a meta-analysis

Author Year Region Sample size Outcome Study design Quality
BPS/IC Control
Hsin-Tzu Liu 2012 Taiwan 30 28 Urinary NGF, NGF/Cr Compared 6
Pradeep Tyagi 2012 USA 10 10 Urinary NGF Compared 5
Mehmet Baykara 2003 Turkey 9 7 Urinary NGF Compared 5
Hsin-Tzu Liu 2007 Taiwan 19 19 Urinary NGF Compared 6
Hsin-Tzu Liu 2009 Taiwan 58 28 Urinary NGF, NGF/Cr Compared 5
Chia-Yen Chen 2010 Taiwan 28 28 Urinary NGF, NGF/Cr Compared 6
Chia-Yen Chen 2010 Taiwan 28 28 Urinary NGF, NGF/Cr Compared 6
Shiu-Dong Chung 2011 Taiwan 22 33 Urinary NGF, NGF/Cr Compared 5
Shiu-Dong Chung 2011 Taiwan 22 33 Urinary NGF, NGF/Cr Compared 5
Mathieu Boudes 2011 Belgium 6 5 Urinary NGF Compared 5
Yuan-Hong Jiang 2013 Taiwan 30 26 Urinary NGF Compared 5
Yuan-Hong Jiang 2014 Taiwan 33 45 Urinary NGF, NGF/Cr Compared 5
  1. NGF nerve growth factor, NGF/Cr ratio of nerve growth factor and creatinin