Influence of the Weight of a School Backpack on Spinal Curvature in the Sagittal Plane of Seven-Year-Old Children

Table 4

The relationship between the child’s school backpack load and the occurrence of changes in the parameters of the child’s body posture in the sagittal plane, using Spearman’s correlation coefficient.

Anthropometric; parameters	, (value)	Interpretation
ThS	−0.3999, (0.017)	The heavier the backpack, the lower the total length of the spine
THL	−0.2313, (0.181)	Not significant
LS	−0.3352, (0.049)	The heavier the backpack, the lower the length of the lumbar lordosis
KKP	−0.2695, (0.117)	Not significant
KKL	−0.5065, (0.002)	The heavier the backpack, the smaller the lumbar lordosis angle
TTI	−0.0537, (0.759)	Not significant
SCR	−0.4279, (0.010)	The heavier the backpack, the smaller the sacral angle

ThS (mm): total length of the spine.
THL (mm): length of the thoracic spine.
LS (mm): length of the lumbar spine.
KKP (degrees): thoracic kyphosis angle.
KKL (degrees): lumbar lordosis angle.
TTI (degrees): total angle of anterior trunk inclination.
SCR (degrees): sacral angle.
: Spearman’s correlation coefficient.