Table 3.
Association between New Zealand Diet Quality Index for Adolescents (NZDQI-A) and body composition measures in the Otago School Students Lifestyle Survey Two (OSSLS2)
| Model 1* (sex-adjusted) | Model 2† (sex- and age-adjusted) | Model 3‡ (multivariate-adjusted) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| β § | 95 % CI | P value | β § | 95 % CI | P value | β § | 95 % CI | P value | |
| BMI Z-score | −0·001 | −0·01, 0·01 | 0·738 | −0·001 | −0·01, 0·01 | 0·749 | −0·003 | −0·01, 0·01 | 0·531 |
| Waist circumference (cm) | −0·01 | −0·07, 0·05 | 0·781 | −0·01 | −0·07, 0·04 | 0·641 | −0·02 | −0·08, 0·04 | 0·554 |
| Waist-to-height ratio | −0·05 | −0·11, 0·01 | 0·103 | −0·05 | −0·11, 0·01 | 0·093 | −0·06 | −0·12, 0·01 | 0·097 |
| Body fat percentage | −0·18 | −0·31, −0·04 | 0·009 | −0·17 | −0·31, −0·03 | 0·014 | −0·19 | −0·35, −0·04 | 0·014 |
| Fat-to-lean mass ratio | −0·23 | −0·41, −0·05 | 0·010 | −0·23 | −0·41, −0·04 | 0·015 | −0·26 | −0·46, −0·05 | 0·016 |
| FMI|| | −0·19 | −0·38, 0·002 | 0·053 | −0·19 | −0·38, 0·004 | 0·055 | −0·23 | −0·45, 0·004 | 0·046 |
| FFMI¶ | 0·05 | −0·01, 0·10 | 0·102 | 0·04 | −0·01, 0·09 | 0·144 | 0·03 | −0·02, 0·08 | 0·241 |
β, unstandardized beta coefficient; FMI, fat mass index; FFMI, fat-free mass index.
Regression models adjusted for sex.
Regression models adjusted for sex and age.
Regression models adjusted for sex, age, ethnicity and socio-economic status (assessed by School Decile Rating).
Regression coefficients expressed as the percentage change in geometric mean of the outcome variable for a unit change in the NZDQI-A score. For BMI Z-score, regression coefficient is expressed as the change in BMI Z-score for a unit change in the NZDQI-A score.
Calculated by dividing fat mass (kg) by the square of height (m2).
Calculated by dividing fat-free mass (kg) by the square of height (m2).