Table 3.
Stepwise multivariable logistic regression model for the associations of socio-demographic and behavioural factors with overweight/obesity
| Variables | Basic model | Expanded model | ||||
|---|---|---|---|---|---|---|
| OR | 95% CI | P-value | OR | 95% CI | P-value | |
| Gender | ||||||
| Boys | 1 | 1 | ||||
| Girls | 2.53 | 1.94–3.32 | <0.0001 | 2.51 | 1.92–3.29 | <0.0001 |
| Age groups, years | 0.325 | 0.325 | ||||
| 7–9 | 1 | 1 | ||||
| 10–12 | 1.16 | 0.75–1.80 | 0.509 | 1.21 | 0.78–1.87 | 0.404 |
| 13–15 | 1.36 | 0.89–2.07 | 0.161 | 1.39 | 0.91–2.12 | 0.132 |
| 16–18 | 1.40 | 0.87–2.24 | 0.167 | 1.45 | 0.90–2.33 | 0.130 |
| Population groups | 0.019 | 0.019 | ||||
| Coloured | 1 | 1 | ||||
| Black | 1.33 | 1.02–1.72 | 0.032 | 1.35 | 1.04–1.75 | 0.024 |
| White | 1.48 | 0.98–2.25 | 0.063 | 1.45 | 0.96–2.21 | 0.080 |
| Region | 0.540 | |||||
| Rural | 1 | |||||
| Semi-urban | 1.36 | 0.81–2.25 | 0.242 | - | - | - |
| Urban | 1.50 | 0.89–2.53 | 0.130 | - | - | - |
| Eating breakfast | ||||||
| No | 1 | |||||
| Yes | 0.83 | 0.63–1.08 | 0.165 | - | - | - |
| Physical inactivity | ||||||
| No | 1 | 1 | ||||
| Yes | 1.32 | 1.01–1.72 | 0.047 | 1.32 | 1.01–1.72 | 0.047 |
| Sedentary behaviour | ||||||
| No | 1 | |||||
| Yes | 1.21 | 0.86–1.70 | 0.284 | - | - | - |
| Smoking | ||||||
| No | 1 | |||||
| Yes | 0.80 | 0.48–1.33 | 0.396 | - | - | - |
| Alcohol | ||||||
| No | 1 | |||||
| Yes | 0.97 | 0.67–1.41 | 0.873 | - | - | - |
Gender: adjusted for age and population groups; Age group: adjusted for gender and population group; Population group: adjusted for gender and age group; Physical inactivity: adjusted for gender, age and population groups; Physical inactivity: Sport and/or walking ≤2 days/week