Associations between demographic characteristics or BMI category and attempts to lose weight
| 8–12 years old | 13–17 years old | |||||
| OR | 95% CI | P value | OR | 95% CI | P value | |
| Year of survey | 1.02 | 1.01 to 1.03 | <0.001 | 1.07 | 1.06 to 1.08 | <0.001 |
| BMI category* | ||||||
| Underweight | 0.18 | 0.08 to 0.40 | <0.001 | N/A | N/A | <0.001 |
| Overweight | 4.01 | 3.47 to 4.64 | <0.001 | 1.96 | 1.58 to 2.42 | <0.001 |
| Obesity | 13.57 | 11.94 to 15.43 | <0.001 | 4.72 | 3.94 to 5.66 | <0.001 |
| Gender | ||||||
| Girls | 1.04 | 0.95 to 1.15 | 0.373 | 2.66 | 2.41 to 2.95 | <0.001 |
| Ethnicity | ||||||
| Asian | 1.72 | 1.43 to 2.07 | <0.001 | 1.57 | 1.29 to 1.93 | <0.001 |
| Black | 1.32 | 1.03 to 1.68 | 0.028 | 1.37 | 1.02 to 1.84 | 0.039 |
| Other and mixed | 1.19 | 0.94 to 1.50 | 0.145 | 1.17 | 0.91 to 1.50 | 0.224 |
| Household income levels | ||||||
| Q1 | 1.21 | 1.01 to 1.44 | 0.036 | 1.18 | 0.98 to 1.42 | 0.086 |
| Q2 | 1.20 | 1.01 to 1.43 | 0.036 | 1.18 | 0.97 to 1.43 | 0.090 |
| Q3 | 1.14 | 0.96 to 1.36 | 0.144 | 1.22 | 1.02 to 1.47 | 0.034 |
| Q4 | 1.06 | 0.88 to 1.27 | 0.564 | 1.09 | 0.90 to 1.33 | 0.372 |
*BMI for age z-score; Q1 (<=GBP11 676.65), Q2 (>GBP11 676.65<=GBP19 117.65), Q3 (>GBP19 117.65<=GBP27 704.92), Q4 (>GBP27 704.92<=GBP47 794.12) and Q5 (>GBP47 794.12). Estimates from multivariable logistic regression model. Each coefficient shows the OR of trying to lose weight compared with the reference category while adjusting for all other determinants of weight loss attempts. Reference groups for categorical variables; boys, whites, >GBP47 794.12, and normal BAZ classification. Estimates for missing category (BAZ classifications and household income) are omitted. For survey year, the OR is per increasing year. There is no OR estimate for 13–17 age group because there was nobody trying to lose weight. P value<0.05 to denote statistical significance.
BAZ, body mass index for age z-score; BMI, body mass index.