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Table 1 Point prevalence of low back pain and extracurricular sports activities among boys by grade

From: Gender differences in the prevalence of low back pain associated with sports activities in children and adolescents: a six-year annual survey of a birth cohort in Niigata City, Japan

Variable E4 E5 E6 J1 J2 J3
ECSA (−)
 n (%) 607 (28.0) 701 (27.0) 883 (34.3) 377 (13.6) 439 (16.5) 2186 (83.9)
 LBP (+) /LBP (−) 15/592 23/678 42/841 22/355 35/404 180/2006
 LBP (+) /n (%) 2.5 3.3 4.8 5.8 8.0 8.2
ECSA (+)
 n (%) 1564 (72.0) 1891 (73.0) 1684 (65.6) 2394 (86.4) 2220 (83.5) 421 (16.1)
 LBP (+) /LBP (−) 44/1520 63/1828 98/1586 171/2223 215/2005 64/357
 LBP (+) /n (%) 2.8 3.3 5.8 7.1 9.7 15.2
 Odds ratio 1.14 1.02 1.24 1.24 1.24 2.00
 (95% CI) (0.63–2.07) (0.63–1.65) (0.85–1.79) (0.79–1.96) (0.85–1.80) (1.47–2.71)**
 PAF (%) 9.1* 1.1 12.8 16.2 15.2 12.0
  1. Abbreviations: ECSA extracurricular sports activities, n number of students, LBP low back pain, PAF population attributable fraction, CI confidence interval. E4–E6 and J1–J3 refer to elementary school grades 4–6 and junior high school grades 1–3, respectively. The PAF among boys was compared with that among girls. *P < 0.05, **P < 0.01