Table 2. Descriptive statistics of variables

Variable	Mean ± SD
Sleep duration (min)	359.24 ± 57.53
PSQI	6.82 ± 3.49
Kyphosis angle (°)	39.82 ± 7.26
Muscle strength (kg)	19.83 ± 11.24
BDI	12.36 ± 10.71

SD: standard deviation, PSQI: pittsburgh sleep quality index, BDI: beck depression inventory.