Table 1.

Baseline characteristics of study participants, Alberta Physical Activity and Breast Cancer Prevention Trial, n = 320

Exercisers (n = 160)Controls (n = 160)
Baseline characteristicMean ± SDMean ± SD
Age (y)61.2 ± 5.460.6 ± 5.7
Body composition measurements
 BMI (kg/m2)29.1 ± 4.529.2 ± 4.3
 Intraabdominal fat area (cm2)101.4 ± 55.4103.2 ± 56.0
 Total body fat (kg)30.9 ± 8.231.3 ± 8.6
 Percent body fat42.2 ± 4.942.4 ± 5.7
Alcohol intake (g/d)4.4 ± 5.95.0 ± 7.6
Total energy intake (kcal/d)1,551.2 ± 598.71,527.3 ± 535.0
Protein intake (g/d)62.3 ± 26.761.6 ± 23.1
Total carbohydrate intake (g/d)196.6 ± 72.8204.0 ± 79.3
Total fat intake (g/d)59.0 ± 33.253.0 ± 24.1
Total dietary fiber intake (g/d)19.6 ± 9.120.5 ± 9.7
Total glycemic load92.2 ± 35.794.1 ± 38.0
Past year total physical activity (MET-h/wk)
 Total physical activity114.2 ± 57.6129.1 ± 77.9
 Occupational activity50.4 ± 49.152.2 ± 57.9
 Household activitya52.9 ± 34.363.9 ± 53.5
 Recreation activity10.2 ± 11.812.1 ± 13.6
Maximal oxygen consumption (mL/kg/min)27.1 ± 6.226.8 ± 6.0
n (%)n (%)
Full-time employment82 (55)79 (51)
Education beyond high school112 (70)102 (64)
Married/common-law113 (71)125 (78)
White/Caucasian144 (91)145 (91)
Ever used hormone therapy75 (47)71 (44)
Regular NSAID userc18 (11)24 (15)
Regular statin userc25 (16)18 (11)
Median (IQR)Median (IQR)
CRPb (mg/L)1.3 (0.6–3.0)1.2 (0.7–2.6)
IL-6 (pg/mL)1.5 (1.1–2.0)1.4 (1.1–2.2)
TNF-α (pg/mL)1.4 (1.2–1.8)1.4 (1.2–1.8)

Abbreviation: IQR, interquartile range.

  • aThere were no statistically significant differences at baseline between exercisers and controls for these variables except for household activity, P value = 0.030.

  • bTop 1% of CRP measures were excluded from analyses resulting in the exclusion of 3 controls and 1 exerciser; resultant sample sizes for CRP were n = 159 for exercisers and n = 157 for controls.

  • cRegular use defined as at least 3 times weekly for at least 1 month during the past year.