The factor structure of the Barratt Impulsiveness Scale (BIS-11) and correlates of impulsivity among outpatients with schizophrenia and other psychotic disorders in Singapore

Table 2 Fit statistics of tested factor structures

Model by:	Factor structure	Number of items	WLSMV χ2 (df)	RMSEA	CFI	TLI	SRMR
Patton et al. (1995) [19]	Unidimensional	30	χ² (405) = 3109.32, p < 0.001	0.13	0.54	0.51	0.16
Patton et al. (1995) [19]	Six first order factors	30	Model does not converge due to covariance matrix of latent variables being not positive definite
Patton et al. (1995) [19]	Three second order, six first order	30	χ² (396) = 2972.48, p < 0.001	0.13	0.57	0.52	0.16
Ireland and Archer (2008) [23]	Three first order	28	Model does not converge
Haden and Shiva (2008) [22]	Two first order	24	χ² (251) = 1176.32, p < 0.001	0.10	0.83	0.81	0.10
Spinella (2007) [47]	Three factor first order (BIS-15)	15	χ²(87) = 652.97, p < 0.001	0.13	0.82	0.78	0.10
Coutlee et al. (2014) [21]	Three factor first order	13	χ² (62) = 581.49, p < 0.001	0.15	0.85	0.81	0.10
Ros et al. (Ros et al., 2020) [48]	Two factor first order	8	χ² (19) = 106.40, p < 0.001	0.11	0.91	0.86	0.07
Final model of the present study in the split half sample	Three factor first order	16	χ² (101) = 161.26, p < 0.001	0.06	0.97	0.96	0.07