The following limitations are ackno

The following limitations are acknowledged in the present
study. First, this is a cross-sectional study, and therefore a
causal relationship was not clear when a significant association
was observed. Longitudinal follow-up studies
may be required. Second, we asked the experiences of
self-injury within a year, not at present, while we asked
recent status of mobile phone use and sleep length.
The timeframes might not be very consistent in the examination
of their association. Third, we used a self-report
questionnaire. Self-report of sleep could be inaccurate.
The information regarding current mental health as well
as mobile phone use might also be less reliable than
interview-based surveys. Fourth, participants with missing
data for length of sleep were larger than other variables.
This may partly be due to the style of the question. We
asked the students to fill the blanks as ‘‘__ hours__ minutes’’
and many students did not fill the minutes. Fifth, we
did not have information about the difference between
weekday and weekend sleep, which could be associated
with psychological health (Kim et al., 2011). Sixth, we

Hasil (Bahasa Indonesia) 1:

Pembatasan berikut diakui di masa kinistudi. Pertama, ini adalah Cross sectional study, dan karena ituhubungan sebab-akibat itu tidak jelas ketika sebuah asosiasi yang signifikandiamati. Penelitian longitudinalmungkin diperlukan. Kedua, kami meminta pengalamanSelf-cedera dalam satu tahun, tidak pada saat ini, sementara kita bertanyastatus terbaru ponsel menggunakan dan tidur panjang.Jangka waktu mungkin tidak akan sangat konsisten dalam pemeriksaanAsosiasi mereka. Ketiga, kami menggunakan self-laporankuesioner. Self-laporan tidur bisa tidak akurat.Informasi tentang kesehatan mental saat ini jugaseperti penggunaan ponsel juga mungkin kurang dapat diandalkan dibandingkansurvei berdasarkan wawancara. Keempat, peserta dengan hilangdata untuk panjang tidur yang lebih besar dari variabel-variabel lainnya.Ini mungkin sebagian karena gaya pertanyaan. Kamimengajak siswa untuk mengisi kekosongan '' __ hours__ menit ''dan banyak siswa tidak mengisi menit. Kelima, kamitidak memiliki informasi tentang perbedaan antarahari kerja dan akhir pekan tidur, yang dapat dikaitkandengan psikologis kesehatan (Kim et al., 2011). Keenam, kami