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Table 1 Demographic characteristics of students

From: Exploring the relationship of sleep quality with drug use and substance abuse among university students: a cross-cultural study

Variables Yemen sample Saudi sample Total
Year of study Frequency (N = 518) Percentage (55.40%) Frequency (N = 417) Percentage (44.60%) 935
First 147 15.72 137 14.65 284 (30.37%)
Second 108 11.55 28 2.99 136 (14.55%)
Third 169 18.07 114 12.19 283 (30.27%)
Fourth 84 8.98 138 14.76 222 (23.74%)
Sex
Male 315 33.69 216 23.10 531 (56.79%)
Female 203 21.71 201 21.50 404 (43.21%)
Marital status
Single 442 47.27 385 41.18 827 (88.45%)
Married 69 7.38 27 2.89 96 (10.27)
Divorced/widower 7 0.75 5 0.53 12 (1.28%)
Age Mean SD Mean SD 935
22.30 3.161 21.25 2.396