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Table 2 Baseline and follow-up demographic and physiological variables among 30 Girl Scout troops (troop-level means) by treatment group (n = 15 control, n = 15 intervention)

From: Increasing weight-bearing physical activity and calcium-rich foods to promote bone mass gains among 9–11 year old girls: outcomes of the Cal-Girls study

Label Baseline Follow-up 1 Follow-up 2 Two-yr Intervention Effect
  C I C I C I EffectA SE
Demographics         
   Girls' race (% white) 90 90 -- -- -- -- -- --
   Family income (% > $90 k) 51 46 -- -- -- -- -- --
   Parent's education (% = college degree) 50 59 -- -- -- -- -- --
   Girls' age (years) 10.5 10.4 11.5 11.4 12.4 12.3 0.04 0.02
Physical Development         
   Breast Stage 1 (%) 37 47 30 40 1 1 -- --
   Breast Stage 2 (%) 55 51 53 55 24 23 -- --
   Breast Stage 3 (%) 7 2 17 5 44 53 -- --
   Breast Stage 4 (%) 0 0 0 0 21 16 -- --
   Breast Stage 5 (%) 0 0 0 0 10 7 -- --
   Pubic Hair Stage 1 (%) 62 73 23 34 5 7 -- --
   Pubic Hair Stage 2 (%) 24 21 33 33 25 23 -- --
   Pubic Hair Stage 3 (%) 13 6 28 25 29 38 -- --
   Pubic Hair Stage 4 (%) 2 0 15 9 38 31 -- --
   Pubic Hair Stage 5 (%) 0 0 1 0 5 1 -- --
   Menarcheal (% yes) 2 0 14 6 34 35 -- --
Body Size and Composition         
   Height (cm) 143.5 142.7 149.7 149.2 155.6 155.5 0.77 0.46
   Weight (kg) 40.5 39.5 45.1 44.2 49.9 49.8 0.90 0.75
   BMI (kg/m2) 19.5 19.3 20.0 19.8 20.5 20.5 0.28 0.26
   Fat Mass (%) 26.1 25.4 25.6 25.3 24.7 24.7 0.62 0.57
   Lean Mass (%) 71.2 71.8 71.5 71.9 72.2 72.3 -0.58 0.55
  1. A Net difference between change in intervention and control troop-level means, I = intervention troops; C = Control troops