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. 2010 Jul 9;10:64. doi: 10.1186/1471-2288-10-64

Table 1.

Covariate Data: Average Imbalance between Study Arms

Base Case
3 Covariatesa
(k = 4 randomised and 40 non-randomised)
Imputed data
5 Covariatesb
(k = 4 randomised and 75 non-randomised)
Study Type
Non-randomised
Average Difference
(EVAR-OSR)
Average Difference
(EVAR-OSR)
Male (proportion) 0.09 0.10
Age (years) 2.40 2.53
Cardiac disease (proportion) 0.12 0.14
Pulmonary disease (proportion) not considered as missing in 43% of the 75 non-randomised studies 0.10
Renal disease (proportion) not considered as missing in 54% of the 75 non-randomised studies 0.05
Randomised
Male (proportion) 0.05 0.05
Age (years) 0.82 0.82
Cardiac disease (proportion) 0.05 0.05
Pulmonary disease (proportion) not considered as missing in 25% of the 4 randomised studies 0.13
Renal disease (proportion) not considered as missing in 50% of the 4 randomised studies 0.07

a.male, age, cardiac disease, b.male, age, cardiac disease, pulmonary disease, renal disease

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