Table 3. Multiple Nested Linear Regression: Associations Between Accelerometer-Derived MVPA and Total Activity Counts per Day With Measurements of Insulin Resistance, NHANES 2003–2006.
| Measurement | Model 1a
|
Model 2b
|
||
|---|---|---|---|---|
| β (SE) | Adjusted Wald F | β (SE) | Adjusted Wald F | |
| Homeostatic model assessment of insulin resistance (HOMA-IR) | ||||
| MVPA ≥2,020 counts/min | −0.002 (0.001) | 0.62 | 0.002 (0.001) | 4.00 |
| Total activity counts/d | −0.000001 (0.0000002) | 58.97c | −0.000001 (0.0000001) | 36.83c |
| Quantitative insulin sensitivity check index (QUICKI) | ||||
| MVPA ≥2,020 counts/min | 0.00004 (0.00004) | 1.10 | −0.00004 (0.00004) | 1.08 |
| Total activity counts/d | 0.00000001 (0.00000001) | 46.71c | 0.00000002 (0.00000004) | 29.44c |
| Homeostatic model assessment of insulin resistance (HOMA-IR) | ||||
| MVPA ≥760 counts/min | 0.001 (0.001) | 2.18 | 0.001 (0.001) | 1.13 |
| Total activity counts/d | −0.000002 (0.0000003) | 31.59c | −0.000001 (0.0000002) | 13.64c |
| Quantitative insulin sensitivity check index (QUICKI) | ||||
| MVPA ≥760 counts/min | −0.00003 (0.00001) | 1.93 | −0.00002 (0.00002) | 0.97 |
| Total activity counts/d | 0.0000001 (0.00000001) | 28.00c | 0.00000003 (0.00000001) | 12.10c |
Abbreviations: MVPA, moderate to vigorous physical activity; NHANES, National Health and Nutrition Examination Survey; SE, standard error.
a
Adjusted for age, sex, race/ethnicity, education, smoking status, diabetes, hypertension, wear time, MVPA, and total activity counts per day.
b
All model 1 covariates plus measured waist circumference.
c
P < .001.