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Table 1 The students' age, gender and posture

From: Photographic measurement of upper-body sitting posture of high school students: A reliability and validity study

  15-year-olds 16-year-olds  
Posture Male Female Male Female Total
Slouched 2 5 4 2 13
Upright 3 2 4 4 13
Normal 2 3 4 4 13
Total 7 10 12 10 39