Table 1.

Inconsistency degrees of freedom in artificial data based on the network meta-analysis by Cipriani et al. (2009).

Data	No. of studies (no. of multi-arm studies)	${\mathbf{I}\mathbf{C}\mathbf{D}\mathbf{F}}^{\mathbf{L}\mathbf{A}}$	${\mathbf{I}\mathbf{C}\mathbf{D}\mathbf{F}}^{\mathbf{F}\mathbf{E}}$	${\mathbf{I}\mathbf{C}\mathbf{D}\mathbf{F}}^{\mathbf{R}\mathbf{E}}$
Data O	111 (2)	NA	31.05	26.99
Data S	50 (0)	0	$-$0.02	$-$0.24
Data T1	58 (0)	2	2.04	1.21
Data T2	68 (0)	5	4.88	2.62
Data T3	109 (0)	31	31.02	26.52
Data M1	52 (2)	NA	$-$0.06	$-$0.13
Data M2	60 (10)	NA	0.01	$-$0.26
Data M3	68 (18)	NA	1.92	1.32

NA, not applicable; the ICDF proposed by Lu and Ades (2006) is applicable to network meta-analyses with two-arm studies only.