Table 2.
Baseline characteristics of participants according to quintiles of dietary fiber intake per meal by using the residual method among adults in the NHANES, 2003–2014.
| Variables | Total Dietary Fiber Intake per Meal | Residual Dietary Fiber Intake per Meal | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Quintile 1 | Quintile 2 | Quintile 3 | Quintile 4 | Quintile 5 | p-Value | ||||||||
| n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | n | Mean (SD) | ||
| Fiber intake at breakfast, g/day | 25,881 | 3.88 (3.49) | 5131 | 2.40 (1.97) | 5136 | 1.98 (1.78) | 5127 | 2.53 (1.97) | 5133 | 4.12 (2.06) | 5131 | 8.40 (4.21) | <0.001 |
| Fiber intake at lunch, g/day | 22,714 | 5.13 (3.95) | 4541 | 3.60 (2.51) | 4539 | 3.07 (2.25) | 4541 | 3.65 (2.38) | 4540 | 5.25 (2.43 | 4541 | 10.08 (2.65) | <0.001 |
| Fiber intake at dinner, g/day | 28,072 | 6.36 (4.68) | 5567 | 4.17 (2.95) | 5567 | 3.824 (2.78) | 5568 | 4.87 (2.86) | 5567 | 6.82 (2.91) | 5567 | 12.18 (5.36) | <0.001 |
| Residual fiber intake at breakfast, g/day | 25,658 | 4.11 (2.65) | 5131 | 1.27 (1.09) | 5136 | 2.85 (0.26) | 5127 | 3.68 (0.25) | 5133 | 4.80 (0.41) | 5131 | 7.97 (2.92) | <0.001 |
| Residual fiber intake at lunch, g/day | 22,702 | 5.06 (2.84) | 4541 | 1.98 (1.20) | 4539 | 3.69 (0.28) | 4541 | 4.59 (0.27) | 4540 | 5.77 (0.45) | 4541 | 9.29 (2.93) | <0.001 |
| Residual fiber intake at dinner, g/day | 27,836 | 6.53 (3.39) | 5567 | 2.80 (1.52) | 5567 | 4.85 (0.33) | 5568 | 5.98 (0.35) | 5567 | 7.47 (0.56) | 5567 | 11.53 (3.43) | <0.001 |
Continuous variables are presented as mean and standard derivation (SD). p-values are calculated by general linear model for variables adjusting for age.