| The table below shows the expected coefficients of variation (CV) for the estimates for adults and childrens and for smaller samples for subgroups. CV of 30% has been used as a threshold by NCHS for presentation criteria. Current NCHS presentation standards** moved away from CV and are based on exact confidence intervals but were established to be consistent with prior criteria. The current standards generally allow for lower prevalence estimates to be released. |
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| CV were calculated assuming a design effect of 2.5 CV in RED are estimates that would not have met the CV critieria for presention. |
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| Table 1. Sample Adults: Coefficients of Variation for estimation variables with varying expected prevalence by expected sample sizes of covariates |
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| SUBGROUP Prevalence: |
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All Adults (100%) |
90% |
80% |
70% |
60% |
50% |
40% |
30% |
20% |
15% |
10% |
5% |
2% |
| SUBGROUP Sample Size: |
|
30,000 |
27,000 |
24,000 |
21,000 |
18,000 |
15,000 |
12,000 |
9,000 |
6,000 |
4,500 |
3,000 |
1,500 |
600 |
| Prevalence of estimation variable: |
Design Effect: |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
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| Variables with prevalence .5% |
0.5% |
12.88 |
13.57 |
14.40 |
15.39 |
16.62 |
18.21 |
20.36 |
23.51 |
28.80 |
33.25 |
40.72 |
57.59 |
91.06 |
| Variables with prevalence 1% |
1% |
9.08 |
9.57 |
10.16 |
10.86 |
11.73 |
12.85 |
14.36 |
16.58 |
20.31 |
23.45 |
28.72 |
40.62 |
64.23 |
| Variables with prevalence 2% |
2% |
6.39 |
6.74 |
7.14 |
7.64 |
8.25 |
9.04 |
10.10 |
11.67 |
14.29 |
16.50 |
20.21 |
28.58 |
45.18 |
| Variables with prevalence 3% |
3% |
5.19 |
5.47 |
5.80 |
6.20 |
6.70 |
7.34 |
8.21 |
9.48 |
11.61 |
13.40 |
16.41 |
23.21 |
36.70 |
| Variables with prevalence 5% |
5% |
3.98 |
4.19 |
4.45 |
4.76 |
5.14 |
5.63 |
6.29 |
7.26 |
8.90 |
10.27 |
12.58 |
17.80 |
28.14 |
| Variables with prevalence 7% |
7% |
3.33 |
3.51 |
3.72 |
3.98 |
4.30 |
4.71 |
5.26 |
6.07 |
7.44 |
8.59 |
10.52 |
14.88 |
23.53 |
| Variables with prevalence 10% |
10% |
2.74 |
2.89 |
3.06 |
3.27 |
3.54 |
3.87 |
4.33 |
5.00 |
6.12 |
7.07 |
8.66 |
12.25 |
19.36 |
| Variables with prevalence 20% |
20% |
1.83 |
1.92 |
2.04 |
2.18 |
2.36 |
2.58 |
2.89 |
3.33 |
4.08 |
4.71 |
5.77 |
8.16 |
12.91 |
| Variables with prevalence 15% |
15% |
2.17 |
2.29 |
2.43 |
2.60 |
2.81 |
3.07 |
3.44 |
3.97 |
4.86 |
5.61 |
6.87 |
9.72 |
15.37 |
| Variables with prevalence 25% |
25% |
1.58 |
1.67 |
1.77 |
1.89 |
2.04 |
2.24 |
2.50 |
2.89 |
3.54 |
4.08 |
5.00 |
7.07 |
11.18 |
| Variables with prevalence 30% |
30% |
1.39 |
1.47 |
1.56 |
1.67 |
1.80 |
1.97 |
2.20 |
2.55 |
3.12 |
3.60 |
4.41 |
6.24 |
9.86 |
| Variables with prevalence 40% |
40% |
1.12 |
1.18 |
1.25 |
1.34 |
1.44 |
1.58 |
1.77 |
2.04 |
2.50 |
2.89 |
3.54 |
5.00 |
7.91 |
| Variables with prevalence 45% |
45% |
1.01 |
1.06 |
1.13 |
1.21 |
1.30 |
1.43 |
1.60 |
1.84 |
2.26 |
2.61 |
3.19 |
4.51 |
7.14 |
| The table below shows the expected coefficients of variation (CV) for the estimates for adults and childrens and for smaller samples for subgroups. CV of 30% has been used as a threshold by NCHS for presentation criteria. Current NCHS presentation standards** moved away from CV and are based on exact confidence intervals but were established to be consistent with prior criteria. The current standards generally allow for lower prevalence estimates to be released. |
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| CV were calculated assuming a design effect of 2.5 CV in RED are estimates that would not have met the CV critieria for presention. |
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| Table 1. Sample Children: Coefficients of Variation for estimation variables with varying expected prevalence by expected sample sizes of covariates |
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| SUBGROUP Prevalence: |
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100% |
90% |
80% |
70% |
60% |
50% |
40% |
30% |
20% |
15% |
10% |
5% |
2% |
| SUBGROUP Sample Size: |
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10,000 |
9,000 |
8,000 |
7,000 |
6,000 |
5,000 |
4,000 |
3,000 |
2,000 |
1,500 |
1,000 |
500 |
200 |
| Prevalence of estimation variable: |
Design Effect: |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
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| Variables with prevalence 2% |
2% |
11.07 |
11.67 |
12.37 |
13.23 |
14.29 |
15.65 |
17.50 |
20.21 |
24.75 |
28.58 |
35.00 |
49.50 |
78.26 |
| Variables with prevalence 3% |
3% |
8.99 |
9.48 |
10.05 |
10.75 |
11.61 |
12.71 |
14.22 |
16.41 |
20.10 |
23.21 |
28.43 |
40.21 |
63.57 |
| Variables with prevalence 5% |
5% |
6.89 |
7.26 |
7.71 |
8.24 |
8.90 |
9.75 |
10.90 |
12.58 |
15.41 |
17.80 |
21.79 |
30.82 |
48.73 |
| Variables with prevalence 7% |
7% |
5.76 |
6.07 |
6.44 |
6.89 |
7.44 |
8.15 |
9.11 |
10.52 |
12.89 |
14.88 |
18.22 |
25.77 |
40.75 |
| Variables with prevalence 10% |
10% |
4.74 |
5.00 |
5.30 |
5.67 |
6.12 |
6.71 |
7.50 |
8.66 |
10.61 |
12.25 |
15.00 |
21.21 |
33.54 |
| Variables with prevalence 20% |
20% |
3.16 |
3.33 |
3.54 |
3.78 |
4.08 |
4.47 |
5.00 |
5.77 |
7.07 |
8.16 |
10.00 |
14.14 |
22.36 |
| Variables with prevalence 15% |
15% |
3.76 |
3.97 |
4.21 |
4.50 |
4.86 |
5.32 |
5.95 |
6.87 |
8.42 |
9.72 |
11.90 |
16.83 |
26.61 |
| Variables with prevalence 25% |
25% |
2.74 |
2.89 |
3.06 |
3.27 |
3.54 |
3.87 |
4.33 |
5.00 |
6.12 |
7.07 |
8.66 |
12.25 |
19.36 |
| Variables with prevalence 30% |
30% |
2.42 |
2.55 |
2.70 |
2.89 |
3.12 |
3.42 |
3.82 |
4.41 |
5.40 |
6.24 |
7.64 |
10.80 |
17.08 |
| Variables with prevalence 40% |
40% |
1.94 |
2.04 |
2.17 |
2.31 |
2.50 |
2.74 |
3.06 |
3.54 |
4.33 |
5.00 |
6.12 |
8.66 |
13.69 |
| Variables with prevalence 45% |
45% |
1.75 |
1.84 |
1.95 |
2.09 |
2.26 |
2.47 |
2.76 |
3.19 |
3.91 |
4.51 |
5.53 |
7.82 |
12.36 |
| The table below shows the expected coefficients of variation (CV) for the estimates for adults and childrens and for smaller samples for subgroups. CV of 30% has been used as a threshold by NCHS for presentation criteria. Current NCHS presentation standards** moved away from CV and are based on exact confidence intervals but were established to be consistent with prior criteria. The current standards generally allow for lower prevalence estimates to be released. |
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| CV were calculated assuming a design effect of 2.5 CV in RED are estimates that would not have met the CV critieria for presention. |
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| Table 1. Sample Adolescents: Coefficients of Variation for estimation variables with varying expected prevalence by expected sample sizes of covariates |
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| SUBGROUP Prevalence: |
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100% |
90% |
80% |
70% |
60% |
50% |
40% |
30% |
20% |
15% |
10% |
5% |
2% |
| SUBGROUP Sample Size: |
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3,600 |
3,240 |
2,880 |
2,520 |
2,160 |
1,800 |
1,440 |
1,080 |
720 |
540 |
360 |
180 |
72 |
| Prevalence of estimation variable: |
Design Effect: |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
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| Variables with prevalence 2% |
2% |
18.45 |
19.44 |
20.62 |
22.05 |
23.81 |
26.09 |
29.17 |
33.68 |
41.25 |
47.63 |
58.33 |
82.50 |
130.44 |
| Variables with prevalence 3% |
3% |
14.98 |
15.80 |
16.75 |
17.91 |
19.34 |
21.19 |
23.69 |
27.36 |
33.51 |
38.69 |
47.39 |
67.01 |
105.96 |
| Variables with prevalence 5% |
5% |
11.49 |
12.11 |
12.84 |
13.73 |
14.83 |
16.24 |
18.16 |
20.97 |
25.69 |
29.66 |
36.32 |
51.37 |
81.22 |
| Variables with prevalence 7% |
7% |
9.61 |
10.12 |
10.74 |
11.48 |
12.40 |
13.58 |
15.19 |
17.54 |
21.48 |
24.80 |
30.37 |
42.96 |
67.92 |
| Variables with prevalence 10% |
10% |
7.91 |
8.33 |
8.84 |
9.45 |
10.21 |
11.18 |
12.50 |
14.43 |
17.68 |
20.41 |
25.00 |
35.36 |
55.90 |
| Variables with prevalence 15% |
15% |
6.27 |
6.61 |
7.01 |
7.50 |
8.10 |
8.87 |
9.92 |
11.45 |
14.03 |
16.20 |
19.84 |
28.05 |
44.36 |
| Variables with prevalence 20% |
20% |
5.27 |
5.56 |
5.89 |
6.30 |
6.80 |
7.45 |
8.33 |
9.62 |
11.79 |
13.61 |
16.67 |
23.57 |
37.27 |
| Variables with prevalence 25% |
25% |
4.56 |
4.81 |
5.10 |
5.46 |
5.89 |
6.45 |
7.22 |
8.33 |
10.21 |
11.79 |
14.43 |
20.41 |
32.27 |
| Variables with prevalence 30% |
30% |
4.03 |
4.24 |
4.50 |
4.81 |
5.20 |
5.69 |
6.36 |
7.35 |
9.00 |
10.39 |
12.73 |
18.00 |
28.46 |
| Variables with prevalence 40% |
40% |
3.23 |
3.40 |
3.61 |
3.86 |
4.17 |
4.56 |
5.10 |
5.89 |
7.22 |
8.33 |
10.21 |
14.43 |
22.82 |
| Variables with prevalence 45% |
45% |
2.91 |
3.07 |
3.26 |
3.48 |
3.76 |
4.12 |
4.61 |
5.32 |
6.51 |
7.52 |
9.21 |
13.03 |
20.60 |