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Segmented data comparison about length of PSCs in two different positions.
| Section (cm) | Supine position | Kneeling seat position | ||
|---|---|---|---|---|
| Total number | Number (percentage) | Total number | Number (percentage) | |
| [0, 40] | 30 | 26 (86.7%) | 30 | 28 (93.4%) |
| [40,80] | 30 | 0 (0%) | 30 | 1 (3.3%) |
| [80,120] | 30 | 4 (13.3%) | 30 | 1 (3.3%) |
