Table 4

Multivariable regression results for outcome changesapredicted by steps/day indicators: HUB City Steps, Mississippi, 2010
Datasetb
Full Truncated Excluded
Outcome Steps/Day Indicator βc P βc P βc P Covariatesd,e
Waist circumference Change in mean steps/dayf −0.33 0.0476 −0.38 0.0419 −0.45 0.0296 BMI, BV
Change in median steps/dayf −0.33 0.0269 −0.33 0.0283 −0.45 0.0123 BMI, BV
Body mass index Met 10,000 steps/dayg −1.05 0.0017 −1.05 0.0017 −1.04 0.0017 Age, BV
Change in mean steps/dayf −0.11 <0.0001 −0.12 <0.0001 −0.13 <0.0001 Age, BV
Change in median steps/dayf −0.10 <0.0001 −0.10 <0.0001 −0.12 <0.0001 Age, BV
Change in 6-category SD-PAf −0.27 0.0009 −0.28 0.0006 −0.34 0.0001 Age, BV
Change in 4-category SD-PAf −0.29 0.0020 −0.29 0.0018 −0.34 0.0005 Age, BV
% Body fat Mean steps/day −0.15 0.0004 −0.16 0.0006 −0.17 0.0078 Age, sex, BV
Median steps/day −0.14 0.0006 −0.14 0.0007 −0.15 0.0084 Age, sex, BV
Met 10,000 steps/dayg −2.23 0.0007 −2.23 0.0007 −2.25 0.0006 Age, sex, BV
Change in mean steps/dayf −0.21 0.0001 −0.22 0.0002 −0.23 0.0004 Age, sex, fitness, BV
Change in median steps/dayf −0.15 0.0016 −0.17 0.0005 −0.20 0.0006 Age, sex, fitness, BV
Change in 6-category SD-PAf −0.56 0.0005 −0.57 0.0004 −0.64 0.0002 Age, sex, fitness, BV
Change in 4-category SD-PAf −0.53 0.0036 −0.55 0.0029 −0.70 0.0007 Age, sex, income, fitness, BV
Fat mass Change in mean steps/dayf −0.29 <0.0001 −0.32 <0.0001 −0.35 <0.0001 Age, sex, BV
Change in median steps/dayf −0.25 <0.0001 −0.25 0.0001 −0.30 <0.0001 Age, sex, BV
Change in 6-category SD-PAf −0.88 <0.0001 −0.90 <0.0001 −1.02 <0.0001 Age, sex, BV
Change in 4-category SD-PAf −0.90 0.0002 −0.91 0.0001 −1.05 <0.0001 Age, sex, BV
Total cholesterol Mean steps/day NS NS NS BV
Median steps/day NS NS NS BV
Met 7,500 steps/dayg NS NS NS BV
Met 10,000 steps/dayg NS NS NS BV
Triglycerides Met 7,500 steps/dayg NS NS NS Fitness, BV
Met 10,000 steps/dayg NS NS NS Fitness, BV
Glucose Met 7,500 steps/dayg NS NS NS DX, fitness, BV

BV, baseline value of corresponding outcome variable; SD-PA, step-defined physical activity; NS, not significant at the 0.05 level; DX = diagnosis for relevant condition (high cholesterol, high blood glucose).

a Change = baseline subtracted from six-month follow-up.

b Full included all steps/day values; truncated included all values with those < 500 recorded as 500 steps/day and those > 30,000 recorded as 30,000 steps/day; excluded included only values between 500 and 30,000 steps/day.

c Continuous variable coefficient per 1,000 steps.

d Included age (years), sex, marital status (married or not married), education (less than high school, high school/GED, some college/technical), income (continuous as 12 categories), current smoker, BMI, DX, fitness (baseline value for 6-minute walk test), compliance (proportion of daily step logs completed), and baseline outcome value.

e For all significant outcome models: age, sex (decrease larger for males), fitness, and baseline outcome values had negative associations; income and baseline BMI values had positive associations.

f Change between intervention weeks 1 and 2 and remaining intervention weeks (3–27). Positive change indicates an increase during intervention

g Percentage of values which met at least 7,500 or 10,000 steps/day.

Thomson et al.

Thomson et al. BMC Public Health 2012 12:983   doi:10.1186/1471-2458-12-983

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