Table 3.
Cluster validation: assessing cluster differences on mean BMI and skinfold thickness
| Non-obesigenic cluster n = 98 | Obesigenic cluster n = 94 | P-value not controlling for parent BMI | P-value controlling for mothers’ BMI | P-value controlling for fathers’ BMI | |
|---|---|---|---|---|---|
| Parents’ BMI | |||||
| Mothers’ BMI when girls age 5 | 25.1 (4.6) | 27.7 (6.5) | <0.05 | — | — |
| Fathers’ BMI when girls age 5 | 27.5 (3.6) | 28.6 (4.8) | NS | — | — |
| Mothers’ BMI when girls age 7 | 25.5 (4.9) | 28.1 (6.9) | <0.01 | — | — |
| Fathers’ BMI when girls age 7 | 27.7 (3.4) | 29.1 (4.9) | <0.05 | — | — |
| Girls’ BMI and skinfold thickness | |||||
| BMI at age 5a | 15.7 (1.3) | 15.9 (1.4) | NS | NS | NS |
| Skinfold thickness at age 5 | 16.4 (3.9) | 17.7 (5.1) | <0.05 | NS | < 0.05 |
| BMI at age 7b | 16.2 (2.0) | 16.9 (2.3) | <0.05 | <0.10 | < 0.10 |
| Skinfold thickness at age 7 | 17.4 (6.2) | 19.6 (7.3) | <0.05 | <0.05 | < 0.10 |
| Change in BMI from age 5 to 7 | 0.5 (1.0) | 1.0 (1.4) | <0.01 | <0.05 | < 0.05 |
| Change in skinfolds from age 5 to 7 | 0.90 (3.0) | 2.0 (3.7) | <0.10 | <0.10 | < 0.10 |
For all analyses assessing differences in changes scores, the variable at time 1 was entered as a control variable.
a
The corresponding mean BMI percentiles based on the CDC 2000 growth charts34 are 58.7 and 60.7 for the non-obesigenic and obesigenic clusters, respectively.
b
The corresponding mean BMI percentiles based on the CDC 2000 growth charts34 are 55.3 and 63.4 for the non-obesigenic and obesigenic clusters, respectively.