Table 2 Trends in the least square mean (± standard error) values for body mass index and waist circumference according to household income and urbanity
1998–2001 | 2010–2012 | P for trends* | P for interaction** | |
|---|---|---|---|---|
Body mass index | ||||
Boys | 20.42 (0.09) | 20.76 (0.11) | 0.0195 | |
Household income | ||||
Low | 20.09 (0.15) | 20.38 (0.20) | 0.2431 | 0.3864 |
Middle | 20.46 (0.15) | 20.73 (0.19) | 0.2676 | |
High | 20.67 (0.16) | 21.28 (0.20) | 0.0175 | |
P-value for trend*** | 0.0101 | 0.0017 | ||
Urbanity | ||||
Rural | 19.96 (0.18) | 20.31 (0.27) | 0.291 | 0.9616 |
Urban | 20.52 (0.10) | 20.86 (0.13) | 0.0379 | |
P-value**** | 0.0087 | 0.083 | ||
Girls | 20.01 (0.08) | 20.14 (0.11) | 0.3435 | |
Household income | ||||
Low | 20.34 (0.16) | 20.26 (0.19) | 0.7782 | 0.7072 |
Middle | 19.86 (0.13) | 20.17 (0.18) | 0.1607 | |
High | 19.87 (0.14) | 19.94 (0.18) | 0.7738 | |
P-value for trend*** | 0.0215 | 0.188 | ||
Urbanity | ||||
Rural | 20.03 (0.17) | 20.47 (0.32) | 0.2438 | 0.3532 |
Urban | 20.00 (0.10) | 20.07 (0.11) | 0.6463 | |
P-value**** | 0.5636 | 0.1752 | ||
Waist circumference (cm) | ||||
Boys | 71.59 (0.25) | 70.75 (0.30) | 0.0308 | |
Household income | ||||
Low | 70.93 (0.43) | 69.98 (0.51) | 0.1527 | 0.3942 |
Middle | 71.57 (0.41) | 70.37 (0.49) | 0.0592 | |
High | 72.20 (0.45) | 72.13 (0.56) | 0.9133 | |
P-value for trend*** | 0.039 | 0.0053 | ||
Urbanity | ||||
Rural | 70.32 (0.48) | 69.69 (0.73) | 0.4722 | 0.7682 |
Urban | 71.87 (0.28) | 70.97 (0.33) | 0.0385 | |
P-value**** | 0.0071 | 0.1363 | ||
Girls | 67.41 (0.22) | 66.85 (0.26) | 0.0952 | |
Household income | ||||
Low | 68.46 (0.39) | 67.09 (0.46) | 0.0244 | 0.1762 |
Middle | 67.18 (0.36) | 66.94 (0.41) | 0.6587 | |
High | 66.69 (0.36) | 66.41 (0.42) | 0.62 | |
P-value for trend*** | 0.0007 | 0.2872 | ||
Urbanity | ||||
Rural | 67.25 (0.42) | 67.83 (0.71) | 0.4802 | 0.122 |
Urban | 67.44 (0.25) | 66.63 (0.27) | 0.0272 | |
P-value**** | 0.8649 | 0.0869 |