Table 1a Sample characteristics by tertiles of adolescents’ dietary knowledge score: CHNS (N = 2035)
Characteristics | Total | Adolescents’ dietary knowledge score | P-value | ||
|---|---|---|---|---|---|
Tertile 1 | Tertile 2 | Tertile 3 | |||
Sample (n) | N = 2035 | N = 485 | N = 702 | N = 848 | |
Age (n, %) | 0.01* | ||||
12–14 | 1113 (54.7) | 296 (61.0) | 371 (52.8) | 446 (52.6) | |
15–17 | 922 (45.3) | 189 (39.0) | 331 (47.2) | 402 (47.4) | |
Sex (n, %) | 0.09 | ||||
Boys | 1,091 (53.6) | 277 (57.1) | 381 (54.3) | 433 (51.1) | |
Girls | 944 (46.4) | 208 (42.9) | 321 (45.7) | 415 (48.9) | |
Residence (n, %) | < 0.01** | ||||
Rural | 1,391 (68.4) | 349 (72.0) | 470 (67.0) | 572 (67.5) | 0.14 |
Urban | 644 (31.6) | 136 (28.0) | 232 (33.0) | 276 (32.5) | |
Family income (n, %) | 0.25 | ||||
Low | 405 (19.9) | 100 (20.6) | 147 (20.9) | 158 (18.6) | |
Medium | 696 (34.2) | 178 (36.7) | 241 (34.3) | 277 (32.7) | |
High | 934 (45.9) | 207 (42.7) | 314 (44.7) | 413 (48.7) | |
Adolescents’ education level (n, %) | < 0.01** | ||||
Low | 292 (14.3) | 97 (20.0) | 90 (12.8) | 105 (12.4) | |
Medium | 1291 (63.4) | 303 (62.5) | 453 (64.5) | 535 (63.1) | |
High | 452 (22.2) | 85 (17.5) | 159 (22.6) | 208 (24.5) | |
Father’s education level (n, %) | 0.06 | ||||
Low | 412 (20.2) | 116 (23.9) | 135 (19.2) | 161 (19.0) | |
Medium | 919 (45.2) | 222 (45.8) | 325 (46.3) | 372 (43.9) | |
High | 704 (34.6) | 147 (30.3) | 242 (34.5) | 315 (37.1) | |
Mother’s education level (n, %) | 0.03* | ||||
Low | 619 (30.4) | 168 (34.6) | 196 (27.9) | 255 (30.1) | |
Medium | 875 (43.0) | 210 (43.3) | 316 (45.0) | 349 (41.2) | |
High | 541 (26.6) | 107 (22.1) | 190 (27.1) | 244 (28.8) | |
Survey year (n, %) | < 0.01** | ||||
2004 | 630 (31.0) | 97 (20.0) | 216 (30.8) | 317 (37.4) | |
2006 | 423 (20.8) | 104 (21.4) | 175 (24.9) | 144 (17.0) | |
2009 | 367 (18.0) | 91 (18.8) | 129 (18.4) | 147 (17.3) | |
2011 | 410 (20.1) | 89 (18.4) | 118 (16.8) | 203 (23.9) | |
2015 | 205 (10.1) | 104 (21.4) | 64( 9.1) | 37(4.4) | |
Adolescents’ BMI (kg/m2), mean (SD) | 19.5 (3.3) | 19.4 (3.6) | 19.5(3.2) | 19.5(3.2) | 0.77 |
Adolescents’ BMI category (n, %) | 0.05 | ||||
Not overweight or obese | 1,799 (88.4) | 414 (85.4) | 629 (89.6) | 756 (89.2) | |
Overweight or obese | 236 (11.6) | 71 (14.6) | 73 (10.4) | 92 (10.8) | |
Father’s BMI (kg/m2), mean (SD) | 23.7 (3.2) | 23.7(3.2) | 23.7(3.1) | 23.7 (3.3) | 0.96 |
Father’s BMI category (n, %) | 0.83 | ||||
Not overweight or obese | 1169 (57.4) | 283 (58.4) | 405 (57.7) | 481 (56.7) | |
Overweight or obese | 866 (42.6) | 202 (41.6) | 297 (42.3) | 367 (43.3) | |
Mother’s BMI (kg/m2), mean (SD) | 23.3 (3.2) | 23.3 (3.2) | 23.2 (3.2) | 23.3 (3.2) | 0.85 |
Mother’s BMI category (n, %) | 0.96 | ||||
Not overweight or obese | 1286 (63.2) | 307 (63.3) | 446 (63.5) | 533 (62.9) | |
Overweight or obese | 749 (36.8) | 178 (36.7) | 256 (36.5) | 315 (37.1) | |