Table 1. Descriptive summary of 24 studies reporting the prevalence and predictors of khat chewing among university students in Ethiopia included in the systematic review and meta-analysis, 2017.

Region	University	Author	Publication year	Sample size	Response rate (%)	Quality score (10 pts)	Prevalence (95% CI)
Addis Ababa	Addis Ababa	Wakgari and Aklilu[6]	2011	800	78	6	14.00 (11.27,16.73)
Amhara	Gondar	Yalemzewod et al [19]	2017	800	92	7	16.44 (13.76,19.12)
	Bahir Dar	Ewenat et al [24]	2014	3872	77.5	6	23.99 (22.46,25.52)
	Gondar	Aklilu et al [28]	2014	310	97.4	6	9.60 (6.28,12.93)
	Gondar	Desalegn et al [32]	2014	682	62.9	5	24.48 (20.41,28.54)
	Woldia	Misgan et al [20]	2017	730	89.7	7	13.00 (10.42,15.58)
	Debre Markos	Girmay and Ahmed[36]	2014	845	96.6	7	28.50 (25.37,31.63)
	Bahir Dar	Ewenat et al [25]	2014	3872	84.4	6	11.00 (9.93,12.07)
Harari	Haramaya	Andualem et al [22]	2014	764	94.99	6	30.30 (26.95,33.65)
	Haramaya	Gezahegn et al [39]	2014	1040	98.3	7	23.60 (21.00,26.20)
Oromia	Jimma	Kanchi and Deribachew[37]	2015	634	97.8	5	17.74 (14.73,20.75)
	Jimma	Tilahun et al [18]	2017	651	95.1	8	23.91 (20.55,27.27)
	Jimma	Kalayu et al [33]	2009	248	92.7	7	33.00 (26.92,39.08)
	Adama	Getu T and Alemayehu M [63]	2012	764	95.3	7	27.70 (24.45,30.95)
	Ambo	Megersa G and Meseret K[42]	2014	264	100	7	56.80 (50.82,62.78)
SNNPR	Hawassa	Andargachew et al [30]	2016	590	94.5	7	16.31 (13.24,19.37)
	Hawassa	Ayalew et al [21]	2015	1290	97.3	7	10.52 (8.82,12.22)
	Hawassa	Andargachew et al [29]	2014	590	99.3	8	20.30 (17.04,23.56)
	WolaitaSodo	Tesfa et al [40]	2017	747	97.05	7	35.70 (24.45,30.95)
	Dilla	Moges[38]	2014	623	98.1	7	41.08 (37.18,44.98)
Somali	Jigjiga	Gamachu et al [23]	2017	648	92.6	6	33.33 (29.56,37.11)
Tigray	Mekele	Kidan[41]	2011	662	90.8	7	14.80 (11.96,17.64)
	Adigrat	Tilahun et al [34]	2015	161	93.17	5	6.67 (2.67,10.66)
	Axum	Measho et al [26]	2013	764	98.7	7	28.70 (25.48,31.93)