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Table 3 The association between BMI and hand grip strength, vertical jump and sit-and-reach in children and adolescents aged 7–18 in China, 2014

From: Muscle fitness and its association with body mass index in children and adolescents aged 7–18 years in China: a cross-sectional study

Hand grip strength Model 1a Model 2
B SE 95% CI p B SE 95% CI p
Age 2.253 0.038 2.178 2.328 < 0.001 2.275 0.038 2.200 2.350 < 0.001
Sex (ref = girls) 6.546 0.239 6.077 7.015 < 0.001 6.580 0.236 6.117 7.043 < 0.001
Residential areas (ref = rural) 0.196 0.255 −0.304 0.695 0.442 0.203 0.256 −0.704 0.298 0.427
Shaanxi (ref = Hainan) 0.822 0.270 0.293 1.352 0.002 0.467 0.272 −0.065 0.999 0.086
Thinness (ref = normal weight) −2.997 0.355 −3.693 −2.301 < 0.001
Overweight/obesity (ref = normal weight) 1.220 0.477 0.285 2.155 0.011
Vertical jump
 Age 0.475 0.046 0.385 0.564 < 0.001 0.442 0.046 0.351 0.532 < 0.001
 Sex (ref = girls) 5.107 0.267 4.584 5.631 < 0.001 5.179 0.267 4.656 5.701 < 0.001
 Residential areas (ref = rural) −0.145 0.304 −0.740 0.450 0.632 0.109 0.309 −0.496 0.715 0.723
 Thinness (ref = normal weight) 0.230 0.385 −0.524 0.985 0.550
 Overweight/obesity (ref = normal weight) −2.681 0.655 −3.965 −1.397 < 0.001
Sit-and-reach
 Age 0.998 0.056 0.888 1.108 < 0.001 0.981 0.057 0.870 1.092 < 0.001
 Sex (ref = girls) −3.193 0.327 −3.834 −2.553 < 0.001 − 3.114 0.327 − 3.754 − 2.473 < 0.001
 Residential areas (ref = rural) 0.180 0.371 −0.907 0.548 0.628 −0.177 0.379 −0.921 0.566 0.640
 Thinness (ref = normal weight) −1.313 0.467 −2.228 −0.399 0.005
 Overweight/obesity (ref = normal weight) −1.623 0.813 −3.216 −0.030 0.046
  1. BMI body mass index (kg/m2), B regression coefficient, SE standard error of regression coefficient, CI confidence interval
  2. aModel 1: adjusted for age, sex, residential areas and study sites; Model 2: adjusted for age, sex, residential areas, study sites (if applicable) and BMI. Age was analyzed as continuous data; sex, BMI, residential areas and study sites were set as dummy variables