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Table 1 Baseline characteristics of participants by BMI status at follow-up after 4 years

From: Does obesity persist from childhood to adolescence? A 4-year prospective cohort study of chinese students in Hong Kong

Baseline Characteristics Follow-up Weight Status (After 4 years)
Underweight
( n  = 1237)
Normal weight
( n  = 13,497)
Overweight
(but not obese)
( n  = 2857)
Obese
( n  = 1272)
p
Sex a c      < 0.0001
 Female ( n  = 8350) 385 (31.1) 6685 (49.5) 971 (34.0) 309 (24.3)  
 Male ( n  = 10,513) 852 (68.9) 6812 (50.5) 1886 (66.0) 963 (75.7)  
Baseline Age in years d 6.76 (0.62) 6.80 (0.74) 6.78 (0.70) 6.56 (0.64) < 0.0001
Baseline BMI z-score d -0.53 (1.46) 0.06 (1.07) 0.75 (1.25) 1.12 (1.51) < 0.0001
Baseline Weight Status
 Underweight c ( n  = 752) 188 (15.2) 492 (3.6) 56 (2.0) 16 (1.3) < 0.0001
 Normal c ( n  = 14,804) 953 (77.0) 11,411 (84.5) 1782 (62.4) 658 (51.7) < 0.0001
 Overweight (but not obese) c ( n  = 2214) 43 (3.5) 1230 (9.1) 729 (25.5) 212 (16.7) < 0.0001
 Obese c ( n  = 1093) 53 (4.3) 364 (2.7) 290 (10.2) 386 (30.3) < 0.0001
 Baseline Fitness Test Overall z-score bd 0.14 (0.58) 0.11 (0.64) 0.11 (0.62) 0.05 (0.63) < 0.0001
Baseline Fitness Test z-score
 Grip strength d 0.05 (1.09) 0.15 (1.00) 0.41 (1.11) 0.25 (1.12) < 0.0001
 Sit-up d 0.05 (1.12) -0.03 (1.12) -0.20 (1.21) -0.32 (1.30) < 0.0001
 Sit and reach d -0.11 (1.02) -0.10 (1.09) -0.37 (1.42) -0.46 (1.54) < 0.0001
 Endurance run d 0.55 (0.84) 0.36 (0.99) 0.17 (0.90) 0.18 (0.84) < 0.0001
  1. aSample sizes for females and males were 8,460 and 10,660, respectively
  2. bAverage of all four fitness tests
  3. c n (%), comparisons were made using Pearson’s χ2 tests
  4. d Mean (SD), Comparisons were made using F-tests