Table 2 The association between sedentary activity time(hour) and lumbar BMD (g/cm2).

From: Correlation between sedentary activity, physical activity and bone mineral density and fat in America: National Health and Nutrition Examination Survey, 2011–2018

 

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

  1. 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.
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