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. Author manuscript; available in PMC: 2014 Oct 6.
Published in final edited form as: J Pediatr. 2012 Jul 20;162(1):183–188.e3. doi: 10.1016/j.jpeds.2012.06.012

Table III.

Demographics analysis

Training (KD, n = 276; FC, n = 243)
Testing (KD, n = 136; FC, n = 121)
KD FC Observations Test statistics P KD FC Observations Test statistics P
Age, mo t test (516 df) = 2.63 .009 t test (254 df) = 2.57 .011
    Observations 276 243 519 136 121 257
    Mean (SD) 37.1 (31.5) 45.7 (42.6) 41.1 (37.3) 34.7 (32.1) 46.9 (43.7) 40.4 (38.4)
Sex, % χ2 (1 df) = 1.92 .166 χ2 (1 df) = 0.6 .44
    Observations 183 153 336 90 78 168
    Female 62 (33.9) 64 (41.8) 126 (37.5) 41 (45.6) 30 (38.5) 71 (42.3)
    Mean (SD) 121 (66.1) 89 (58.2) 210 (62.5) 49 (54.4) 48 (61.5) 97 (57.7)
Race, % Fisher exact test .043 χ2 (4 df) = 5.15 .273
    Observations 272 230 502 134 114 248
    African-American 11 (4) 6 (2.6) 17 (3.4) 5 (3.7) 4 (3.5) 9 (3.6)
    American Indian/Alaskan Native 1 (0.4) 0 (0) 1 (0.2) 0 (0) 0 (0) 0 (0)
    Asian 43 (15.8) 21 (9.1) 64 (12.7) 22 (16.4) 10 (8.8) 32 (12.9)
    White 64 (23.5) 64 (27.8) 128 (25.5) 39 (29.1) 28 (24.6) 67 (27)
    Hawaiian/Other Pacific Islander 2 (0.7) 0 (0) 2 (0.4) 0 (0) 0 (0) 0 (0)
    Hispanic 88 (32.4) 95 (41.3) 183 (36.5) 44 (32.8) 44 (38.6) 88 (35.5)
    Mixed 63 (23.2) 44 (19.1) 107 (21.3) 24 (17.9) 28 (24.6) 52 (21)

*The number of the subcategories violates the assumptions of the χ2 test, and so Fisher exact test was used.