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Table 3 Potential sources of bias

From: Idiopathic pulmonary fibrosis and diabetes mellitus: a meta-analysis and systematic review

Study Environmental Exposure (IG/CG) Family IPF (IG/CG)
Enomoto et al. [7] 2003 Not stated Not stated Not stated Not stated
Miyake et al. [8] 2005 31.7% 8.3% Not stated Not stated
Gribbin et al. [10] 2009 Not stated Not stated Not stated Not stated
Ma et al. [9] 2010 dust 56.7%
smoke 66.0%
chemicals 28.9%
dust 52.1%
smoke 69.3%
chemicals 21.4%
Not stated Not stated
Garcia-Sancho et al. [24] 2011 Matched by place of residence Matched by place of residence 20% 8.7%
Kim et al. [25] 2015 Not stated Not stated Not stated Not stated
Dalleywater et al. [27] 2015 Not stated Not stated Not stated Not stated
Zhong et al. [28] 2016 Not stated Not stated Not stated Not stated
Xu et al. [26] 2020 Not stated Not stated Not stated Not stated
  1. IG IPF Group, CG Control Group