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Table 1 Participant Demographics for IMPACT at Baseline and Follow-up Measurement Periods, 2000–2002.

From: Increasing physical activity and decreasing sedentary activity in adolescent girls – The Incorporating More Physical Activity and Calcium in Teens (IMPACT) study

CHARACTERISTIC BASELINE (Fall 2000) FOLLOW-UP (Spring 2002)
  Number Percent Number Percent
TOTAL STUDENTS 718   606  
Control 371 52% 315 52%
Intervention 347 48% 291 48%
ETHNICITY
Non-Hispanic White 515 72% 436 72%
Hispanic 83 12% 73 12%
African-American 39 5% 27 5%
Other 80 11% 69 11%
ONSET OF MENSES 140 20% 407 67%
  Mean SD Mean SD
AGE IN YEARS 11.6 ± 0.4 13.2 ± 0.4