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pick mattock
piko

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the target population of our study consisted of all students in fars province, which is the fourth largest province in iran with a population of 4,851,274 individuals (in 2016), and shiraz, the capital of this province, with a population of 1,869,001(the fifth populated city in iran). based on statistics reports till 2020, the province consists of 9696 schools, 41,340 classrooms, and 895,042 students, including 440,708 female and 454,334 male students
sample size estimation was performed based on a study by erfani et al. [11] and by considering a confidence level of 95%, with a d (margin of error) of 0.01, minimum proportion of good attitude and sleep equaling to 30%, and 8067 participants calculated, and based on the variations in the living locations and type of schools (private vs public) and applying a design effect of 2.5, reaching a final sample size of approximately 20,200 participants