Table 1.
Sample size by survey year and demographic characteristics of subjects who completed Korea National Health and Nutrition Examination Survey (KNHANES) 2010–2012, 2013–2015 and 2016–2018.
| KNHANES V (2010–2012) (N = 2394) |
KNHANES VI (2013–2015) (N = 1996) |
KNHANES VII (2016–2018) (N = 1731) |
p-Value (2) | |
|---|---|---|---|---|
| Sex | 0.6728 | |||
| Boys | 1259 (53.3) (1) | 1065 (52.0) | 904 (52.1) | |
| Girls | 1135 (46.7) | 931 (48.0) | 827 (47.9) | |
| Age | 0.6422 | |||
| 10–12 years | 980 (33.8) | 750 (32.7) | 675 (32.4) | |
| 13–15 years | 829 (33.7) | 684 (33.4) | 576 (32.4) | |
| 16–18 years | 585 (32.5) | 562 (33.9) | 480 (35.2) | |
| Anthropometry | ||||
| Height (cm) | 160.6 ± 0.3 | 160.6 ± 0.3 | 161.3 ± 0.3 | 0.0162 |
| Weight (kg) | 53.4 ± 0.4 | 54.5 ± 0.4 | 54.8 ± 0.4 | <0.0001 |
| BMI (kg/m2) | 20.4 ± 0.1 | 20.9 ± 0.1 | 20.8 ± 0.1 | <0.0001 |
| Waist circumference (cm) | 68.8 ± 0.3 | 70.2 ± 0.3 | 70.0 ± 0.3 | 0.236 |
| Household income level | 0.0213 | |||
| Low | 264 (14.1) | 217 (11.6) | 170 (10.4) | |
| Medium-low | 595 (29.0) | 522 (27.6) | 404 (24.0) | |
| Medium-high | 757 (29.7) | 665 (33.0) | 573 (33.1) | |
| High | 750 (27.2) | 578 (27.9) | 582 (32.4) | |
| Residential area | 0.1194 | |||
| Rural | 343 (17.6) | 327 (16.7) | 224 (12.0) | |
| Urban | 2051 (82.4) | 1669 (83.3) | 1507 (88.0) | |
| Nutrient intake | ||||
| Energy (kcal/day) | 2147.7 ± 20.7 | 2138.1 ± 21 | 2106.9 ± 23.9 | <0.0001 |
| Carbohydrate (g/day) | 332.6 ± 3.2 | 320.1 ± 3.2 | 313.6 ± 3.9 | 0.3723 |
| % energy of total intake | 63.0 | 60.6 | 60.3 | <0.0001 |
| Protein (g/day) | 77.5 ± 1.0 | 76 ± 1.0 | 77.2 ± 1.1 | <0.0001 |
| % energy of total intake | 14.3 | 14.1 | 14.6 | 0.7072 |
| Fat (g/day) | 56.4 ± 0.9 | 58.1 ± 0.9 | 57.8 ± 1.0 | <0.0001 |
| % energy of total intake | 22.8 | 23.9 | 24.1 | <0.0001 |
(1) Values are presented as N (%) and means ± standard error. (2) p-values were calculated by general linear regression for continuous variables and chi-square for categorical variables.