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Table 1 Characteristics of the study population included in this study

From: Insulin and risk of diabetic retinopathy in patients with type 2 diabetes mellitus: data from a meta-analysis of seven cohort studies

Study Year of publication Study design Data source Country All subjects DR cases Study period Sex Confounders for adjustment
Gunnlaugsdottir E 2012 Prospective Population based Iceland 4,995 138 1967-1997 M/F Age, sex, systolic BP. duration of DM, oral hypoglycaemic, HbA1c, hypertension and microlbuminuria
Geir Bertelsen 2012 Prospective Population based Norway 514 110 2007-2008 M/F Age, sex, systolic BP, oral hypoglycaemic, HbA1c, hypertension and microlbuminuria, BMI, glaucose
Schweitzer K 2009 Prospective Population based American 500 175 2004-2007 M/F NA
Romero-Aroca P 2007 Prospective Hospital based Spain 741 205 2005.1-2005.12 M/F NA
Hove MN 2004 Restropective Population based Denmark 10,851 378 2000.1-2000.12 M/F NA
Henricsson M 1996 Prospective Hospital based Sweden 1,378 438 1990-1995 M/F Age, sex and duration of diabetes
Deng Y 2014 Prospective Population based China 128 267 2009-2010 M/F Age of diabetic onset, duration of diabetes, BMI, microalbuminuria,HbA1c, fasting plasma glucose, creatinine
  1. NA, not applicable; M: male; F: female; BP: blood pressure; BMI: body bass index; DR: diabetic retinopathy.