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Table 4 Chi-Square Test for the percentage of relative SA above 1.0 year in the gender, BMI, and age groups

From: Accelerated skeletal maturation is associated with overweight and obesity as early as preschool age: a cross-sectional study

Group N (%) x2 df Sig.
Gender
 Male (n = 730) 94 (12.9%) 0.000 1 ns
 Female (n = 600) 78 (13.0%)
BMI
 Thinness (n = 102) 8 (7.8%) 89.442 3 **
 Normal (n = 796) 56 (7.0%)
 Overweight (n = 286) 63 (22.0%)
 Obese (n = 146) 45 (30.8%)
Age a
 3.5 y (n = 234) 9 (3.8%) 43.417 5 **
 4.0 y (n = 176) 23 (13.1%)
 4.5 y (n = 276) 29 (10.5%)
 5.0 y (n = 282) 38 (13.5%)
 5.5 y (n = 254) 43 (16.9%)
 6.0 y (n = 108) 30 (27.8%)
  1. BMI body mass index. Relative SA: relative skeletal age (skeletal age -chronological age)
  2. **P < 0.01
  3. a3.5 years (3.1–3.9 years), 4.0 years (4.0–4.4 years), 4.5 years (4.5–4.9 years), 5.0 years (5.0–5.4 years), 5.5 years (5.5–5.9 years), 6.0 years (6.0–6.6 years)