Table 5.
Relative contribution of school-level and individual factors in the variance of hypertension and obesity in school-going adolescents aged 12–17 years. Study of Cardiovascular Risks in Adolescents (ERICA), Brazil, 2013–2014
| Hypertension | Obesity | |||||||
|---|---|---|---|---|---|---|---|---|
| Model | Variance | se | ICC (%) | PCV (%) | Variance | se | ICC (%) | PCV (%) |
| Empty model | ||||||||
| School level† | 0·525 | 0·068 | 13·8 | 0·535 | 0·114 | 13·9 | ||
| Individual level | 3·290 | 86·2 | 3·290 | 86·1 | ||||
| Total variance | 3·815 | 100·0 | 3·825 | 100·0 | ||||
| Model 1 | ||||||||
| School level† | 0·564 | 0·062 | −7·4 | 0·469 | 0·010 | 12·4 | ||
| Individual level | 3·290 | 3·290 | ||||||
| Total variance | 3·854 | 3·759 | ||||||
| Model 2 | ||||||||
| School level† | 0·621 | 0·077 | −18·2 | 0·484 | 0·101 | 9·5 | ||
| Individual level | 3·290 | 3·290 | ||||||
| Total variance | 3·911 | 3·774 | ||||||
| Model 3 | ||||||||
| School level† | 0·590 | 0·080 | −12·4 | 0·476 | 0·102 | 11·3 | ||
| Individual level | 3·290 | 3·290 | ||||||
| Total variance | 3·880 | 3·766 | ||||||
ICC, intraclass correlation coefficient obtained by the latent variable method( 22 ); PCV, proportional change in variance( 23 , 24 ).
Empty model, without independent variables; model 1, contextual variables; model 2, individual variables; model 3, contextual and individual variables.
†
The school-level variance (se) was obtained using multilevel logistic regression of mixed effects (‘melogit’ command, Stata version 15).