Table 5.
Comparison between methods used to define weight status – weighted kappa (κ w), 95 % confidence interval and interpretation according to Landis and Koch( 31 ): children and adolescents (n 1519), KwaZulu-Natal, South Africa
| Boys | Girls | |||||
|---|---|---|---|---|---|---|
| κ w | 95 % CI | Interpretation( 31 ) | κ w | 95 % CI | Interpretation( 31 ) | |
| WHO BAZ( 24 )/Cole-IOTF BAZ( 27 , 29 ) | ||||||
| Grade 1 (age 7 years) | 0·41 | 0·19, 0·62 | Fair | 0·54 | 0·39, 0·69 | Moderate |
| Grade 5 (age 11 years) | 0·65 | 0·54, 0·76 | Substantial | 0·61 | 0·42, 0·79 | Moderate |
| Grade 9 (age 15 years) | 0·66 | 0·46, 0·86 | Substantial | 0·80 | 0·72, 0·88 | Substantial |
| WHO BAZ( 24 )/body fat %( 30 ) | ||||||
| Grade 1 (age 7 years) | 0·34 | 0·20, 0·48 | Fair | 0·42 | 0·23, 0·61 | Moderate |
| Grade 5 (age 11 years) | 0·27 | 0·11, 0·44 | Fair | 0·44 | 0·29, 0·58 | Moderate |
| Grade 9 (age 15 years) | 0·13 | 0·06, 0·20 | Slight | 0·68 | 0·54, 0·81 | Substantial |
| Cole-IOTF BAZ( 27 , 29 )/body fat %( 30 ) | ||||||
| Grade 1 (age 7 years) | 0·27 | 0·09, 0·45 | Fair | 0·51 | 0·39, 0·63 | Moderate |
| Grade 5 (age 11 years) | 0·38 | 0·24, 0·52 | Fair | 0·62 | 0·45, 0·79 | Substantial |
| Grade 9 (age 15 years) | 0·24 | 0·03, 0·46 | Fair | 0·70 | 0·55, 0·86 | Substantial |
| WHO BAZ( 24 )/NCHS/WHO WAZ( 25 ) | ||||||
| Grade 1 (age 7 years) | 0·42 | 0·30, 0·53 | Moderate | 0·49 | 0·36, 0·61 | Moderate |
| Grade 5 (age 11 years) | 0·41 | 0·24, 0·59 | Moderate | 0·52 | 0·35, 0·69 | Moderate |
| Grade 9 (age 15 years) | 0·39 | 0·23, 0·55 | Fair | 0·49 | 0·34, 0·65 | Moderate |
| Cole-IOTF BAZ( 27 , 29 )/NCHS/WHO WAZ( 25 ) | ||||||
| Grade 1 (age 7 years) | 0·34 | 0·12, 0·57 | Fair | 0·35 | 0·21, 0·50 | Fair |
| Grade 5 (age 11 years) | 0·42 | 0·22, 0·62 | Moderate | 0·44 | 0·23, 0·65 | Moderate |
| Grade 9 (age 15 years) | 0·55 | 0·31, 0·78 | Moderate | 0·49 | 0·45, 0·53 | Moderate |
| Body fat %( 30 )/NCHS/WHO WAZ( 25 ) | ||||||
| Grade 1 (age 7 years) | 0·32 | 0·08, 0·56 | Fair | 0·39 | 0·17, 0·62 | Fair |
| Grade 5 (age 11 years) | 0·15 | 0·003, 0·30 | Slight | 0·28 | 0·16, 0·39 | Fair |
| Grade 9 (age 15 years) | 0·15 | 0·09, 0·22 | Slight | 0·44 | 0·27, 0·61 | Moderate |
BAZ, BMI-for-age Z-score; IOTF, International Obesity Taskforce; NCHS, National Center for Health Statistics; WAZ, weight-for-age Z-score.