Box plots of OR for fracture risk ±95% CI for children who did less than four episodes of vigorous physical activity per week, those who did four to six, and those who did daily or more in (A) children with an estimated TBLH vBMD in the lowest tertile and (B) children with an estimated TBLH vBMD in the highest tertile. p values are the test for trend. Results are adjusted for all variables in Tables 1-4. For box plot A, 27 children had fractures in the less than four episodes of vigorous physical activity per week category, 23 in those who did four to six, and 18 in those who did daily or more. For box plot B, 19 children had fractures in the less than four episodes of vigorous physical activity per week category, 14 in those who did four to six, and 15 in those who did daily or more.