Table 1.
Agreement and correlations between BAI, percent body fat (%BF), and BMI baseline measurements and difference scores in African-American and Caucasian midlife women who completed anthropometric measurements and DXA scans ≤90 days apart in a given year.
| Baseline measurements
| ||||||||
|---|---|---|---|---|---|---|---|---|
| n | Mean (SD)
|
BAI/%BFagreement
|
Pearson correlationd
|
|||||
| BAIa | BMIa | %BFa | ρc, (95% CI)b | Bias (95% CI)c | BAI/%BF | BMI/%BF | ||
| African-American | 156 | 35.9 (6.2) | 31.6 (6.7) | 45.1 (8.0) | .39 (.31, .46) | −9.2 (−19.8, 1.4) | .74 | .74 |
| Caucasian | 196 | 33.2 (5.9) | 27.4 (5.6) | 41.4 (8.7) | .45 (.38, .52) | −8.2 (−19.0, 2.7) | .78 | .81 |
| Total | 352 | 34.4 (6.2) | 29.3 (6.4) | 43.0 (8.6) | .44 (.39, .49) | −8.6 (−19.4, 2.1) | .77 | .78 |
|
| ||||||||
| Change scores
| ||||||||
| n | Mean (SD)
|
BAIΔ/%BFΔ agreement
|
Pearson correlationd
|
|||||
| BAIΔ | BMIΔ | %BFΔ | ρc, (95% CI)b | Bias (95% CI)c | BAIΔ/%BFΔ | BMIΔ/%BFΔ | ||
| African-American | 91 | .37 (2.44) | .23 (1.71) | .09 (3.36) | .36 (.19, .53) | .28 (−6.22, 6.78) | .38 | .48 |
| Caucasian | 157 | .27 (2.31) | .18 (1.91) | −.21 (3.50) | .43 (.32, .55) | .47 (−5.69, 6.64) | .48 | .59 |
| Total | 248 | .31 (2.35) | .20 (1.84) | −.10 (3.44) | .41 (.31, .50) | .40 (−5.88, 6.68) | .44 | .55 |
Significant group difference by t-test at p<.001.
Lin’s concordance correlation coefficient (ρc), which is a function of both the Pearson correlation between two measures, and the deviation of their best-fit line from perfect concordance (a 45-degree line through the origin).
The Bland-Altman limits-of-agreement method yields a bias score reflecting the mean difference between the BAI and %BF, as well as the 95% confidence interval (CI) around the mean difference.
All reported Pearson correlations are significant at p<.001