. 2011 Aug 11;6(8):e23224. doi: 10.1371/journal.pone.0023224

Table 3.

	Standardized Difference of Mean		Ratio of Variance	Ratio of Residual Variance
	(Criteria 1)		(Criteria 2)	(Criteria 3)
	Before Matching	After Matching
Age	1.154	0.076	1.41	1.43^‡
BMI	0.125	0.0533	1.17	1.182^‡
Diabetes	0.114	0.0728	1.06	1.116^‡
Gender	0.758	0.078	1.09	0.938^‡
Propensity Score	1.287	0.0311^‡	1.06^‡	0.004

^‡

Values required for satisfying rigorous matching criteria.