Table 1

Pairwise association (chi-square test statistics and corresponding p-values) between reason to use and type of supplements used (all athletes who use supplements n = 520), testing H0: independence

No time preparing meal

Avoid sickness

Over-come injury

Doctors' advice


Iron

χ2 = 1.798

χ2 = 11.940

χ2 = 0.350

χ2 = 35.004

p = .180

p = .001

p = .554

p <.001

Ginseng

χ2 = 7.636

χ2 = 0.757

χ2 = 3.238

χ2 = 4.055

p = .006

p = .384

p = .072

p = .044

Multi Vitamin

χ2 = 9.103

χ2 = 6.427

χ2 = 0.970

χ2 = 0.190

p = .003

p = .011

p = .325

p = .892

Vitamin C

χ2 = 0.104

χ2 = 54.671

χ2 = 0.012

χ2 = 0.005

p = .747

p <.001

p = .912

p = .944

Magnesium

χ2 = 1.267

χ2 = 0.140

χ2 = 6.997

χ2 = 1.883

p = .260

p = .708

p = .008

p = .170

Echinacea

χ2 = 1.206

χ2 = 40.343

χ2 = 0.806

χ2 = 0.003

p = .272

p <.001

p = .369

p = .959


*Statistically significant associations (at p ≤ .001) are in bold.

Petróczi et al. Nutrition Journal 2007 6:34   doi:10.1186/1475-2891-6-34

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