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Table 2 Point prevalence of low back pain and extracurricular sports activities among girls 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 (%) 1126 (49.4) 1322 (48.5) 1422 (52.5) 660 (23.2) 746 (27.0) 2437 (89.3)
 LBP (+) /LBP (−) 35/1091 42/1280 49/1373 42/618 55/691 196/2241
 LBP (+) /n (%) 3.1 3.2 3.4 6.4 7.4 8.0
ECSA (+)
 n (%) 1154 (50.6) 1405 (51.5) 1284 (47.5) 2188 (76.8) 2016 (73.0) 292 (10.7)
 LBP (+) /LBP (−) 29/1125 65/1340 82/1202 163/2005 180/1836 40/252
 LBP (+) /n (%) 2.5 4.6 6.4 7.5 8.9 13.7
 Odds ratio 0.80 1.48 1.91 1.20 1.23 1.81
 (95% CI) (0.49–1.32) (1.00–2.20)† (1.33–2.75)** (0.84–1.70) (0.90–1.69) (1.26–2.61)**
 PAF (%) −10.7 19.0** 28.8** 12.2 13.3 7.0
  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 girls was compared with that among boys. P = 0.05, **P < 0.01