Table 1.
Demographic characteristics according to sample participating in NHANES 2013-2016
| Demographic Characteristic | Overall Sample | Plasma Fluoride Sample | Water Fluoride Sub- sample a |
|---|---|---|---|
| n = 1985 N= 25,942,026 |
n=1983 N= 25,930,302 |
n= 1742 N= 23,287,332 |
|
| Age (yrs.); Mean (SE) | 15.38 (0.07) | 15.37 (0.07) | 15.32 (0.07) |
| Sex; N (%) | |||
| Male | 13,672,321(52.7) | 13,665,854 (52.7) | 12,494,779 (53.7) |
| Female | 12,269,705 (47.3) | 12,264,448 (47.3) | 10,792,553 (46.3) |
| BMI; M (SE) | 24.34 (0.24) | 24.34 (0.24) | 24.21 (0.25) |
| BMI Categories b; N (%): | |||
| Underweight | 841,241 (3.3) | 834,774 (3.2) | 724,010 (3.1) |
| Normal Weight | 14,660,261 (56.8) | 14,660,261 (56.8) | 13,422,456 (57.9) |
| Overweight | 4,698,550 (18.2) | 4,698,550 (18.2) | 4,144,842 (17.9) |
| Obese | 5,608,569 (21.7) | 5,603,312 (21.7) | 4,901,026 (21.1) |
| Race/ethnicity | |||
| Mexican American; N (%) | 3,806,271 (14.7) | 3,801,014 (14.7) | 3,160,150 (13.6) |
| Other Hispanic | 1,953,725 (7.5) | 1,953,725 (7.5) | 1,635,251 (7.0) |
| Non-Hispanic White | 14,544,657 (56.1) | 14,544,657 (56.1) | 13,382,896 (57.5) |
| Non-Hispanic Black | 3,220,902 (12.4) | 3,220,902 (12.4) | 2,871,360 (12.3) |
| Non-Hispanic Asian | 1,069,372 (4.1) | 1,069,372 (4.1) | 967,296 (4.2) |
| Other Race-Including Multi-Racial | 1,347,100 (5.2) | 1,340,634 (5.2) | 1,270,379 (5.5) |
| Daily Protein Intake (gm) | 75.52 (1.21) | 75.53 (1.21) | 75.86 (1.30) |
| Ratio of Family Income to Poverty | 2.47 (0.10) | 2.47 (0.10) | 2.51 (0.10) |
Note. Sampling weights were applied for calculation of demographic descriptive statistics and therefore Ns for frequencies represent the weighted sample size. Re-weighting for the dietary sample was not applied for calculation of descriptive statistics above.
a
Participants who reported that they did not drink the tap water were excluded;
b
n = 1972 for entire sample, n = 1970 for plasma F sample and n = 1732 for water F subsample due to missing data for this variable