Table 5. Adjusted means (95% CL) for continuous hematologic variables across quartiles of total sedentary time in U.S. adults ≥ 20 years (NHANES 2003–2006).
| Sedentary Time | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | ptrend | |||||||||
| Mean | 95% CL | Mean | 95% CL | Mean | 95% CL | Mean | 95% CL | ||||||
| White blood cell count (1000 cells/μL) | |||||||||||||
| Model 1a | 6.7 | 6.3 | 7.2 | 6.8 | 6.3 | 7.4 | 6.8 | 6.3 | 7.4 | 6.9 | 6.3 | 7.6 | 0.042 |
| Model 2b | 7.3 | 6.7 | 7.9 | 7.4 | 6.9 | 8.1 | 7.4 | 6.8 | 8.0 | 7.5 | 6.8 | 8.2 | 0.040 |
| Red blood cell count (million cells/μL) | |||||||||||||
| Model 1a | 4.8 | 4.7 | 4.9 | 4.8 | 4.7 | 5.0 | 4.8 | 4.7 | 5.0 | 4.8 | 4.7 | 5.0 | 0.606 |
| Model 2c | 4.6 | 4.5 | 4.8 | 4.6 | 4.5 | 4.8 | 4.7 | 4.5 | 4.8 | 4.6 | 4.5 | 4.8 | 0.700 |
| Platelet count (1000 cells/μL) | |||||||||||||
| Model 1a | 266.2 | 250.0 | 283.1 | 267.1 | 248.8 | 286.4 | 267.0 | 247.4 | 287.7 | 266.2 | 247.4 | 286.0 | 0.999 |
| Model 2d | 263.3 | 246.4 | 281.0 | 264.3 | 244.8 | 285.0 | 264.3 | 244.0 | 285.8 | 263.4 | 244.1 | 283.8 | 0.984 |
Data are back-transformed adjusted means (95% CL). MVPA = moderate-vigorous physical activity. Quartile cut points are 389, 472, 553 minutes/day.
a Adjusted for age, sex, race/ethnicity, wear time.
b Adjusted for age, sex, race/ethnicity, wear time, MVPA, time of year, HEI-2015 score, current illness (flu, pneumonia, or ear infection), asthma, donated blood, poverty income ratio, BMI, smoking status, marital status.
c Adjusted for age, sex, race/ethnicity, wear time, MVPA, time of year, HEI-2015 score, asthma, anemia, blood transfusion, arthritis, cancer or malignancy, poverty income ratio, BMI, marital status, smoking status.
d Adjusted for age, sex, race/ethnicity, wear time, MVPA, time of year, HEI-2015 score, current illness (flu, pneumonia, or ear infection), donated blood, blood transfusion, asthma, arthritis, cancer or malignancy, BMI, marital status, smoking status, poverty income ratio.