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Relationship between (a) VO2max (6MWT) and directly measured VO2max (r = 0.437, p = 0.033, t = 2.28); (b) VO2max (6MWT) and VO2max (Gerkin) (r = 0.483, p = 0.017, t = 2.59); and (c) VO2max (Gerkin) and directly measured VO2max (r = 0.719, p<0.001, t = 5.06).
