Table C
Prevalence of calcium intake below adequate intake (AI) using Method 3 and Method 4 for combining intake from food/beverages and supplements, by age group and sex, household population aged 1 or older, Canada excluding territories, 2004

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  Below AI
Expected values for estimate of % of population % 95% confidence interval
Minimum Maximum from to
Method 3 (divide, add, shrink)
1 to 3 (both sexes)
2.5E 2.9E 2.6E 1.5 3.8
4 to 8 (both sexes)
15.3 22.9 18.7 15.2 22.2
9 to 13
Males
 53.8 63.2 60.9 55.5 66.4
Females
 72.5 83.6 81.9 77.1 86.8
14 to 18
Males
 45.1 51.7 49.9 44.0 55.8
Females
 71.1 83.8 81.8 77.7 85.8
19 to 30
Men
 41.2 47.3 45.0 37.7 52.2
Women
 55.9 69.8 61.7 55.7 67.6
31 to 50
Men
 51.5 61.5 57.5 52.6 62.4
Women
 48.9 72.6 60.0 55.5 64.4
51 to 70
Men
 61.5 86.2 79.6 76.2 83.0
Women
 47.7 91.8 68.1 65.1 71.1
71 or older
Men
 66.1 89.9 81.0 75.9 86.0
Women
 51.6 94.7 74.6 71.3 77.9
Method 4 (divide, shrink, add)
1 to 3 (both sexes)
F 2.7E 2.1E 0.7 3.5
4 to 8 (both sexes)
15.9 23.8 19.5 15.2 23.9
9 to 13
Males
 53.9 63.1 61.5 56.6 66.5
Females
 72.9 83.8 82.9 78.4 87.4
14 to 18
Males
 46.5 53.2 51.6 46.4 56.7
Females
 71.6 84.7 82.8 79.2 86.4
19 to 30
Men
 40.6 46.7 43.8 36.0 51.6
Women
 57.4 71.1 63.9 58.5 69.4
31 to 50
Men
 52.3 63.2 58.9 53.7 64.1
Women
 50.1 74.0 61.9 57.8 66.1
51 to 70
Men
 61.8 86.6 80.0 76.6 83.3
Women
 47.8 91.4 68.3 65.2 71.4
71 or older
Men
 66.2 90.1 81.6 77.1 86.2
Women
 51.7 94.7 74.7 70.7 78.7
E use with caution (coefficient of variation 16.6% to 33.3%)
F too unreliable to be published
Notes: Minimum and maximum values for Method 3 estimated with Method 1 using separate distributions and are combined with (1-α)*percent below AI from supplement non-users plus α*percent below AI from users, where α is percentage of supplement users. Based on assumption that all supplement users have intake at or above AI. Minimum and maximum values for Method 4 estimated with Method 2 using separate empirical distributions that were combined.
Source: Canadian Community Health Survey - Nutrition 2004.