. Author manuscript; available in PMC: 2015 Sep 29.

Published in final edited form as: J Ethnopharmacol. 2014 Jul 23;155(3):1467–1472. doi: 10.1016/j.jep.2014.07.030

Table 4. Psychometric characteristics for the SDS-khat for the whole sample and separated per gender.

SDS-khat items	Whole sample				Males sample				Females sample
	Corrected item-total correlation	Cronbach's Alpha if item deleted	Factors loadings		Corrected item-total correlation	Cronbach's Alpha if item deleted	Factors loadings		Corrected item-total correlation	Cronbach's Alpha if item deleted	Factors loadings
	Corrected item-total correlation	Cronbach's Alpha if item deleted	Factor 1	Factor 2	Corrected item-total correlation	Cronbach's Alpha if item deleted	Factor 1	Factor 2	Corrected item-total correlation	Cronbach's Alpha if item deleted	Factor 1	Factor 2
Item 1	0.47	0.50	0.69		0.43	0.40	0.74		0.45	0.44	0.61
Item 2	0.40	0.52	0.82		0.45	0.39	0.81		0.32	0.52	0.84
Item 3	0.26	0.59		0.73	0.23	0.53		0.77	0.20	0.58		0.74
Item 4	0.25	0.59		0.79	0.12	0.58		0.75	0.26	0.55		0.70
Item 5	0.39	0.52	0.75		0.30	0.49	0.73		0.42	0.46	0.74
Cronbach's alpha	0.60				0.54				0.57
Variance explained (%)			38.96%	20.84%			36.69%	22.98%			37.77%	20.43%

Item 1: Did you ever think that your khat chewing (altakzeen) was out of control?. Item 2: Did the prospect of not chewing (takzeen) any khat make you anxious or worried? Item 3: Did you worry about your khat chewing (altakzeen)? Item 4: Did you wish you could stop chewing khat (altakzeen)? Item 5: How difficult would you find it to stop or go without khat chewing (altakzeen)?