Table 4
Ratio of within-individual variance over total variance for vitamin C intake, by age group, sex and use of supplements, household population aged 1 or older, Canada excluding territories, 2004

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Age group/Sex Vitamin C intake from food/beverages only Vitamin C intake from food/beverages and supplements
One distribution Supplement non-users Supplement users Total population (Method 1) Supplement users
Ratio Standard error Ratio Standard error Ratio Standard error Ratio Standard error Ratio Standard error
1 to 3 (both sexes) 0.53 0.03 0.53 0.04 0.52 0.06 0.42† 0.03 0.34† 0.05
4 to 8 (both sexes) 0.69 0.05 0.81* 0.05 0.57 0.07 0.54† 0.03 0.41† 0.05
9 to 13
Males 0.68 0.03 0.69 0.04 0.66 0.06 0.48† 0.03 0.27† 0.04
Females 0.72 0.03 0.71 0.04 0.72 0.06 0.49† 0.03 0.30† 0.05
14 to 18
Males 0.66 0.03 0.67 0.03 0.64 0.07 0.45† 0.02 0.20† 0.03
Females 0.67 0.03 0.69 0.04 0.67 0.07 0.44† 0.03 0.19† 0.03
19 to 30
Men 0.72 0.04 0.75 0.04 0.65 0.09 0.49† 0.03 0.17† 0.04
Women 0.72* 0.04 0.65* 0.04 0.88 0.07 0.37† 0.02 0.27† 0.03
31 to 50
Men 0.61 0.04 0.64 0.05 0.55 0.08 0.36† 0.03 0.15† 0.04
Women 0.53 0.03 0.56 0.04 0.49 0.05 0.29† 0.02 0.14† 0.03
51 to 70
Men 0.58 0.03 0.60 0.03 0.55 0.07 0.31† 0.02 0.11† 0.03
Women 0.61 0.03 0.59 0.03 0.67 0.05 0.25† 0.02 0.15† 0.02
71 or older
Men 0.51 0.03 0.54 0.04 0.49 0.07 0.27† 0.02 0.09† 0.03
Women 0.53 0.02 0.52 0.03 0.54 0.04 0.19† 0.01 0.12† 0.02
* significantly different from estimate for supplement users
† significantly different from estimate for food/beverages only population in same age/sex group
Source: Canadian Community Health Survey - Nutrition 2004.