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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

From: Differences in personal and lifestyle characteristics among Zimbabwean high school adolescents with and without recurrent non-specific low back pain: a two part cross-sectional study

Variable Outcome measure LBP No LBP Statistic p value
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
  1. *Fishers exact test, aStandard deviation, bBody weight