Characteristics of included articles by Funding Source (n = 61).

*Includes articles that were sponsored by glitazone company, another drug company and other non -drug company funding (n = 2) and by glitazone company and non-drug-company (n = 2).**Data from 5 articles were excluded because they were published in journals that had no impact factor. Of the N = 56 trials reported in journals with impact factors, median value N = 2.84, mean value = 4.63, range (0.34–44.02) and standard deviation σ = 6.06.***Sample size characteristics, median value N = 252, mean value = 390, range (20–4360) and standard deviation σ = 590.4.