TABLE 2.
Usual iron intake estimated by the IMAPP software and the UCD/NCI SIMPLE macro among children and adolescents 9–18 y of age by sex and age using data from the NHANES 2011–20141
| Inadequate intake, % | Mean, mg/d | 25th percentile, mg/d | 50th percentile (median), mg/d | 75th percentile, mg/d | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Subgroup | IMAPP | SIMPLE | IMAPP | SIMPLE | IMAPP | SIMPLE | IMAPP | SIMPLE | IMAPP | SIMPLE |
| Female (9–13 y) | 1.2 | 0.6 (0, 2.4) | 13.0 | 13.1 (12.1, 14.0) | 10.7 (10.1, 11.3) | 10.8 (9.7, 11.8) | 12.8 (12.3, 13.3) | 12.8 (12.0, 13.5) | 15.2 (14.5, 15.9) | 15.0 (13.2, 16.9) |
| Female (14–18 y) | 14.5 | 15.2 (12.4, 18.0) | 12.3 | 12.3 (11.8, 12.9) | 9.8 (9.3, 10.3) | 9.8 (9.3, 10.3) | 11.9 (11.4, 12.4) | 11.9 (11.4, 12.4) | 14.3 (13.6, 15.0) | 14.5 (13.6, 15.3) |
| Male (9–13 y) | 0.0 | 0.0 (0, 0.1) | 15.8 | 15.9 (14.5, 17.3) | 13.4 (12.8, 14.0) | 13.6 (12.2, 15.0) | 15.5 (14.9, 16.1) | 15.6 (14.3, 17.0) | 18.0 (17.2, 18.8) | 17.9 (16.0, 19.9) |
| Male (14–18 y) | 4.6 | 2.7 (0, 5.5) | 19.0 | 18.9 (17.5, 20.3) | 13.8 (13.0, 14.6) | 13.6 (12.1, 15.0) | 17.6 (16.8, 18.4) | 17.7 (16.3, 19.0) | 22.6 (21.2, 24.0) | 22.9 (21.1, 24.7) |
Values generated from the SIMPLE macro are mean (95% CI). IMAPP only produces SEs for percentiles by default when estimating iron usual intake; therefore, we only present the CIs for percentiles. Estimates from IMAPP are within the CIs of the estimates from the SIMPLE macro. Usual iron intake was estimated based on the assumption of 18% iron absorption and mixed oral contraceptive use among females. The SIMPLE macro was applied in a way that is analogous to the way IMAPP functions (stratifying analyses of different age and sex groups, without applying any other covariates). NCI, National Cancer Institute; NHANES, National Health and Nutrition Examination Survey; SIMPLE, Simulating Intake of Micronutrients for Policy Learning and Engagement; UCD, University of California, Davis.