Table 5.

Anthropometric, dietary, and accelerometry physical activity data in the FIT trial

Measure	Description	Construct Validity	Reliability Coefficient
Primary
z-BMI	BMI normalized to age and sex calculated from height (measured to 0.1 cm/Shorr height board) and weight (measured to 0.1 kg/SECA 880 digital scale). Calculated from Centers for Disease Control sex specific 2000 reference curves (NutStat EpiInfo)	Percentage body fat (DXA) r=0.80 (boys) r=0.78 (girls)
Secondary
Waist	Measured to 0.1 cm using natural waist protocol/flexible measuring tape.	Weight r=0.92	r=0.99 (inter-rater)
Skin fold	Measured at 2 sites (subscapular and tricep) to 0.5 mm using BRAND calipers.
Dietary recalls	Estimates of daily energy (calories), fat grams, fruit and vegetable intake calculated from 3 random, telephone-administered 24-hour recall interviews (2 weekday, 1 weekend day).
Accelerometry PA	Estimates of PA collected using Actical accelerometers. Body movement measured omni-directionally and recorded in 1-minute epochs during 7 days of wear. Raw data converted to METS using previously validated cutpoints.	Actiwatch r=0.93	r=0.62

Note. BMI=body mass index; DXA=dual-energy X-ray absorptiometry