Table 2.

Means ± SD of positive and negative affect ratings of non-, occasional and regular users of khat during baseline, stress and recovery periods

	Non-users		Occasional users		Regular users
	men	women	men	women	men	women
Positive affect
Baseline	4.14 ± 1.84	3.45 ± 1.30	3.42 ± 1.22	2.61 ± 1.39	3.27 ± 1.32	2.93 ± 0.83
Stress	3.72 ± 1.47	3.12 ± 1.43	3.47 ± 1.27	1.75 ± 0.65	2.67 ± 1.30	2.25 ± 0.53
Recovery	4.24 ± 1.80	3.39 ± 1.55	3.63 ± 1.58	2.06 ± 1.22	3.01 ± 1.24	2.34 ± 1.16
Negative affect
Baseline	0.87 ± 0.67	1.04 ± 1.04	1.07 ± 0.76	1.22 ± 0.81	1.14 ± 0.96	1.00 ± 0.91
Stress	0.94 ± 0.67	1.21 ± 0.66	1.20 ± 1.04	1.99 ± 1.07	1.86 ± 1.45	1.72 ± 1.69
Recovery	0.82 ± 0.69	1.00 ± 0.88	1.20 ± 1.08	1.06 ± 0.79	1.43 ± 1.15	1.33 ± 0.80