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Table 1 Subject characteristics of 11–12 and 14–15 year old boys and girls

From: Physical activity and sedentary behavior among adolescents in rural South Africa: levels, patterns and correlates

  11-12 years 14-15 years
  Boys (n = 98) Girls (n = 97) Boys (n = 91) Girls (n = 95)
Age (yrs) 12.1 ± 0.6 12.1 ± 0.6 15.1 ± 0.7 15.1 ± 0.6
Weight (kg) 35.8 ± 6.8c 40.7 ± 10.6c 50.7 ± 10.0A 55.2 ± 11.2A
Height (cm) 145.0 ± 7.1c 148.8 ± 7.9c 163.1 ± 8.7B 159.8 ± 5.5B
BMI (kg/m2) 16.9 ± 2.0b 18.2 ± 3.7b 18.9 ± 2.4C 21.6 ± 4.1C
Pubertal stage (n,%)     
 Tanner 1 42 (43%)b 20 (21%)b 10 (11%)B 1 (1%)B
 Tanner 2 33 (34%) 45 (47%) 11 (12%) 5 (5%)
 Tanner 3 19 (19%) 29 (30%) 34 (38%) 40 (43%)
 Tanner 4 4 (4%) 3 (3%) 32 (36%) 41 (44%)
 Tanner 5 0 (0%) 0 (0%) 2 (2%) 7 (7%)
  1. All values are means ± standard deviation. Comparisons between sex and age groups were completed using ANOVA when data was normally distributed and Mann–Whitney U-test for non-normally distributed data. aP < 0.05, bP < 0.01 and cp < 0.001 for boys vs. girls in the 11-12-year age group; AP < 0.05, BP < 0.01 and Cp < 0.001 for boys vs. girls in the 14-15-year age group.