Prevalence of each body mass index (BMI) category in age-stratified groups during 2010–2012
| BMI category (kg/m2) | 2010–2012 | 2010 | 2011 | 2012 | p Value* |
|---|---|---|---|---|---|
| n (%) | n (%) | n (%) | n (%) | ||
| 21–24 years | |||||
| <18.5 | 78 923 (16.38%) | 5398 (13.52%) | 29 669 (16.09%) | 43 856 (17.02%) | <0.0001 |
| 18.5–23.9 | 354 143 (73.47%) | 30 533 (76.49%) | 135 764 (73.64%) | 187 846 (72.89%) | <0.0001 |
| 24–27.9 | 40 959 (8.50%) | 3381 (8.47%) | 15 907 (8.63%) | 21 671 (8.41%) | 0.0360 |
| ≥28 | 7939 (1.65%) | 606 (1.52%) | 3015 (1.64%) | 4318 (1.68%) | 0.0620 |
| 25–34 years | |||||
| <18.5 | 170 839 (13.21%) | 23 862 (10.72%) | 80 151 (13.75%) | 66 826 (13.71%) | <0.0001 |
| 18.5–23.9 | 954 314 (73.82%) | 171 923 (77.27%) | 426 107 (73.07%) | 356 284 (73.12%) | <0.0001 |
| 24–27.9 | 137 529 (10.64%) | 21 893 (9.84%) | 63 253 (10.85%) | 52 383 (10.75%) | <0.0001 |
| ≥28 | 30 209 (2.33%) | 4838 (2.17%) | 13 564 (2.33%) | 11 807 (2.42%) | <0.0001 |
| 35–49 years | |||||
| <18.5 | 11 909 (5.77%) | 2389 (5.71%) | 6043 (5.90%) | 3477 (5.60%) | 0.0280 |
| 18.5–23.9 | 146 221 (70.85%) | 30 644 (73.19%) | 71 454 (69.81%) | 44 123 (71.00%) | <0.0001 |
| 24–27.9 | 39 376 (19.08%) | 7161 (17.10%) | 20 285 (19.82%) | 11 930 (19.20%) | <0.0001 |
| ≥28 | 8864 (4.30%) | 1679 (4%) | 4575 (4.47%) | 2610 (4.2%) | <0.0001 |
*χ2 test for comparing the prevalence of each BMI category in different years.