Table 3 Comparisons of the adolescents with recurrent non-specific low back pain and those without on relative school bag weight, BMI and CSR scores

BMI (kg/m²)

Mean (SD)^a

24.8 (2.88)

25.2 (3.07)

t(62) = 1.65

0.10

School bag weight/kg

Mean (SD)

5.27 (0.92)

4.78 (0.89)

t(62) = −2.16

0.03

Relative school bag weight (%)

Mean (SD)

8.51 (2.08)

7.78 (1.69)

t(62) = −1.55

0.13

School bag weight (%)

<10 % ^bBW (light)

23 (71.9)

29 (90.6)

0.11*

≥10 % BW (heavy)

9 (29.1)

3 (9.40

Relative school bag weight

Mean (SD)

8.51 (2.08)

7.77 (1.69)

t(62) = −1.55

0.13

CSR scores (cm)

<0 (inflexible)

22 (68.8)

11 (34.4)

Χ² (1) = 7.6

0.006

≥0 (flexible)

10 (31.2)

21 (65.6)

CSR scores (cm)

Mean (SD)

−1.91 (3.47)

0.56 (2.69)

t(62) = 3.18

0.002