Table 2 .

Zero inflated negative binomial analysis of discrepancies, retraction status, year of publication, journal impact factor, and trial report citations. Only retraction status was significantly associated in both the excess zero components (negatively, in that trial reports are less likely to have zero discrepancies) and binomial components (positively, in that retracted trial reports are more components of the model)

	Incidence rate ratio or odds ratio* (95% CI)	P
Univariable analysis
Binomial component
Intercept	4.65 (3.03 to 7.15)	<0.001
Retraction	1.62 (0.97 to 2.69)	0.06
Excess zero component
Intercept	0.78 (0.37 to 1.62)	0.50
Retraction	0.11 (0.01 to 0.79)	0.03
Multivariable analysis
Binomial component
Intercept	2.45 (0.90 to 6.65)	0.08
Retraction	1.79 (1.07 to 2.99)	0.03
Year	1.05 (0.99 to 1.11)	0.11
Impact factor	0.95 (0.90 to 1.00)	0.07
Citations	1.00 (1.00 to 1.01)	0.24
Excess zero component
Intercept	4.22 (0.41 to 43.2)	0.23
Retraction	0.14 (0.03 to 0.67)	0.01
Year	0.88 (0.76 to 1.02)	0.08
Impact factor	0.98 (0.83 to 1.16)	0.79
Citations	1.01 (1.00 to 1.01)	0.26

*Incidence rate ratios for binomial components, odds ratios for excess zero components.