Sample characteristics (Mean±SD or percent).

BMIbaseline and BMI when first started walking ≥12 mi/week (BMIstarting walking) reported by 96.80% and 72.36% of the sample, respectively. Significant of trend by standard linear regression or logistic regression: * P<0.05; † P<0.01; § P<0.0001; ¶ P<10−15.

本研究样本中，96.80%与72.36%的受试者分别报告了基线身体质量指数（Baseline Body Mass Index, BMIbaseline）以及首次每周步行≥12英里时的身体质量指数（BMIstarting walking）。经标准线性回归或逻辑回归分析得到的趋势具有统计学显著性：* P<0.05；† P<0.01；§ P<0.0001；¶ P<10⁻¹⁵。