Table 1 Background characteristics of the study groups, who agreed to have their blood tested in 2004, 2017, and 2019
Characteristics | 2004* | 2017 | 2019 | |||
|---|---|---|---|---|---|---|
N | % | n | % | n | % | |
Gender | ||||||
Male | 535 | 52.3 | 344 | 45.8 | 346 | 47.7 |
female | 493 | 47.7 | 407 | 54.2 | 379 | 52.3 |
Age (year) | ||||||
Mean ± SD | 9.4 ± 1.3 | 10.1 ± 1.2 | 10.8 ± 0.9 | |||
6–8 | 255 | 24.8 | 81 | 10.8 | – | – |
9–12 | 773 | 75.2 | 670 | 89.2 | 725 | 100 |
Nutritional status | ||||||
Under | 31 | 3.1 | 27 | 3.6 | 15 | 2.1 |
Normal | 576 | 56 | 523 | 69.6 | 502 | 69.2 |
Over | 421 | 40.9 | 201 | 26.8 | 208 | 28.7 |
Total number | 1028 | 100 | 751 | 100 | 725 | 100 |