Table 2.
The association between sedentary activity time(hour) and lumbar BMD (g/cm2).
| Model 1 β (95% CI) P value | Model 2 β (95% CI) P value | Model 3 β (95% CI) P value | |
|---|---|---|---|
| Sedentary activity time(hour) | − 0.0001 (− 0.0010, 0.0008) 0.827 | − 0.0009 (− 0.0018, − 0.0000) 0.041 | − 0.0011 (− 0.0020, − 0.0002) 0.022 |
| Sedentary activity time categories | |||
| Q1(< 4 h) | Reference | Reference | Reference |
| Q2(4–5.5 h) | − 0.0015 (− 0.0103, 0.0072) 0.735 | − 0.0065 (− 0.0150, 0.0021) 0.139 | − 0.0066 (− 0.0152, 0.0019) 0.128 |
| Q3(5.5–7 h) | − 0.0026 (− 0.0124, 0.0073) 0.610 | − 0.0102 (− 0.0199, − 0.0006) 0.038 | − 0.0109 (− 0.0206, − 0.0011) 0.029 |
| Q4(> 7 h) | − 0.0003 (− 0.0081, 0.0075) 0.934 | − 0.0075 (− 0.0153, 0.0002) 0.056 | − 0.0091 (− 0.0173, − 0.0009) 0.029 |
| P for trend | 0.990 | 0.077 | 0.036 |
| Subgroup analysis stratified by gender | |||
| Men | − 0.0007 (− 0.0019, 0.0005) 0.260 | − 0.0012 (− 0.0024, 0.0000) 0.055 | − 0.0011 (− 0.0024, 0.0002) 0.087 |
| Women | 0.0007 (− 0.0006, 0.0019) 0.292 | − 0.0004 (− 0.0016, 0.0008) 0.498 | − 0.0009 (− 0.0022, 0.0003) 0.155 |
| Subgroup analysis stratified by age | |||
| 20–34 | − 0.0018 (− 0.0031, − 0.0005) 0.006 | − 0.0022 (− 0.0035, − 0.0010) < 0.001 | − 0.0015 (− 0.0029, − 0.0002) 0.026 |
| 35–49 | 0.0018 (0.0003, 0.0032) 0.015 | 0.0008 (− 0.0007, 0.0022) 0.296 | 0.0008 (− 0.0007, 0.0023) 0.293 |
| ≥ 50 | − 0.0002 (− 0.0022, 0.0019) 0.882 | − 0.0016 (− 0.0036, 0.0005) 0.142 | − 0.0036 (− 0.0058, − 0.0015) 0.001 |
| Subgroup analysis stratified by race/ethnicity | |||
| Mexican American | 0.0010 (− 0.0011, 0.0031) 0.338 | 0.0006 (− 0.0015, 0.0027) 0.582 | 0.0002 (− 0.0020, 0.0024) 0.859 |
| Other Hispanic | 0.0015 (− 0.0013, 0.0043) 0.304 | 0.0011 (− 0.0017, 0.0039) 0.441 | − 0.0000 (− 0.0030, 0.0029) 0.977 |
| Non-Hispanic white | − 0.0017 (− 0.0032, − 0.0002) 0.025 | − 0.0016 (− 0.0031, − 0.0001) 0.032 | − 0.0019 (− 0.0035, − 0.0003) 0.018 |
| Non-Hispanic black | − 0.0003 (− 0.0023, 0.0017) 0.800 | − 0.0001 (− 0.0021, 0.0019) 0.902 | 0.0003 (− 0.0018, 0.0023) 0.811 |
| Other race—including multi-racial | − 0.0001 (− 0.0021, 0.0019) 0.921 | − 0.0006 (− 0.0026, 0.0014) 0.548 | 0.0001 (− 0.0019, 0.0022) 0.887 |
Model 1: no covariates were adjusted. Model 2: age and race/ethnicity were adjusted. Model 3: age, race/Hispanic origin, gender, drinking behavior, smoking behavior, BMI, PIR, total protein, serum calcium, cholesterol, serum phosphorus, blood urea nitrogen, Vitamin D, physical activity, SUA. Abbreviation: SUA: serum uric acid. PIR: poverty income ratio. BMI: body mass index.