Table 3.

Internal consistency and inter-item correlations for the three factors of the BHE scale in individual studies and study combined

		Individual study				Combined (N=609)
		PREFER (N=171)	SMART (N=187)	SELF (N=129)	EMPOWER (N=128)
Factor 1 (10 items)	Cronbach’s α	0.854	0.853	0.853	0.806	0.850
	Range of inter-item correlation	0.224–0.488	0.171–0.579	0.141–0.612	0.163–0.583	0.224–0.567
	Range of item-total correlation	0.459–0.637	0.409–0.662	0.424–0.684	0.376–0.575	0.440–0.635
Factor 2 (7 items)	Cronbach’s α	0.773	0.765	0.665	0.786	0.758
	Range of inter-item correlation	0.222–0.616	0.123–0.569	.003–0.500	0.144–0.593	0.145–0.576
	Range of item-total correlation	0.403–0.649	0.367–0.683	0.183–0.560	0.400–0.651	0.365–0.651
Factor 3 (3 items)	Cronbach’s α	0.554	0.512	0.409	0.580	0.520
	Range of inter-item correlation	0.153–0.380	0.145–0.375	0.038–0.314	0.200–0.483	0.113–0.392
	Range of item-total correlation	0.313–0.485	0.262–0.421	0.143–0.437	0.300–0.485	0.265–0.461
BHE (20 items)	Cronbach’s α	0.881	0.868	0.849	0.865	0.871
	Range of inter-item correlation	0.017–0.616	0.001–0.579	0.003–0.612	0.002–0.593	0.018–0.576
	Range of item-total correlation	0.343–0.636	0.306–0.624	0.144–0.639	0.331–0.616	0.326–0.609

Factor 1 = Self-control and Motivation; Factor 2 = Daily Mechanics; Factor 3 = Social Support.