Table 5.
Adjusted1 physical activity levels (hrs/week) before and after a diagnosis of breast cancer by BMI (N = 812).
| BMI < 25 | BMI: 25–29.9 | BMI > 29.9 | P for Trend | |
|---|---|---|---|---|
| Mean ± SE (n = 401) | Mean ± SE (n = 246) | Mean ± SE (n = 165) | ||
| Total PA2 | ||||
| Before Diagnosis | 18.8 ± 0.2 | 19.0 ± 0.2 | 18.9 ± 0.2 | .7 |
| After Diagnosis | 17.1 ± 0.5 | 17.0 ± 0.6 | 16.1 ± 0.8 | .3 |
| Absolute Difference | −1.7 ± 0.5 c | −2.0 ± 0.6 c | −2.8 ± 0.8 c | .2 |
| % Difference | −9.0% | −10.5% | −14.8% | .2 |
| Light-Intensity PA3 | ||||
| Before Diagnosis | 11.4 ± 0.3 | 11.4 ± 0.4 | 11.8 ± 0.4 | .5 |
| After Diagnosis | 10.8 ± 0.4 | 10.7 ± 0.5 | 10.5 ± 0.6 | .6 |
| Absolute Difference | −0.7 ± 0.4 | −0.8 ± 0.5 | −1.4 ± 0.6 | .3 |
| % Difference | −6.1% | −7.0% | −11.9% | .3 |
| Moderate-Intensity PA4 | ||||
| Before Diagnosis | 6.6 ± 0.2 | 7.0 ± 0.3 | 6.5 ± 0.4 | .9 |
| After Diagnosis | 5.7 ± 0.3 | 6.0 ± 0.4 | 5.4 ± 0.5 | .6 |
| Absolute Difference | −0.9 ± 0.3 c | −1.0 ± 0.4 c | −1.1 ± 0.5 c | .7 |
| % Difference | −13.6% | −14.3% | −16.9% | .7 |
| Vigorous-Intensity PA5 | ||||
| Before Diagnosis | 0.7 ± 0.1 | 0.5 ± 0.1 | 0.5 ± 0.1 | .1 |
| After Diagnosis | 0.5 ± 0.1 | 0.3 ± 0.1a | 0.2 ± 0.1a | .01 |
| Absolute Difference | −0.2 ± 0.1c | −0.3 ± 0.1 c | −0.3 ± 0.1 c | .5 |
| % Difference | −28.6% | −60.0% | −60.0% | .5 |
| Sports/Recreational PA | ||||
| Before Diagnosis | 2.9 ± 0.3 | 2.8 ± 0.2 | 2.9 ± 0.4 | .4 |
| After Diagnosis | 2.2 ± 0.1 | 1.9 ± 0.1 | 1.7 ± 0.2 a | .01 |
| Absolute Difference | −0.7 ± 0.1 c | −1.0± 0.1c | −1.2 ± 0.2 c | .01 |
| % Difference | −24.1% | −35.7% | −41.4% | .01 |
| Household PA | ||||
| Before Diagnosis | 14.4 ± 1.1 | 14.5 ± 0.6 | 14.3 ± 1.2 | .5 |
| After Diagnosis | 13.4 ± 0.5 | 13.8 ± 0.6 | 13.3 ± 0.7 | .9 |
| Absolute Difference | −1.0 ± 0.5 | −0.6 ± 0.6 | −1.1 ± 0.7 | .9 |
| % Difference | −6.9% | −4.1% | −7.7% | .9 |
| Sedentary6 | ||||
| Before Diagnosis | 38.9 ± 1.0 | 38.8 ± 1.3 | 45.2 ± 1.6 | .006 |
| After Diagnosis | 41.8 ± 1.0 | 41.4 ± 1.3 | 51.1 ± 1.6 | .0001 |
| Absolute Difference | 3.0 ± 0.8c | 2.6 ± 1.0c | 5.9 ± 1.2abc | .04 |
| % Difference | 7.7% | 6.7% | 13.1%ab | .04 |
Least square means adjusted for age, menopausal status, education, race, ethnicity, study site, season, time from diagnosis to interview, before diagnosis physical activity level, adjuvant treatment, tamoxifen therapy, family history of breast cancer, full-time employment, smoking status, marital status, self-reported physician-diagnosed type 2 diabetes, and overall health.
Total physical activity is the sum of light, moderate, and vigorous intensity physical activity. Total physical activity is also the sum of sports and household activity.
Light intensity: < 3 METs
Moderate intensity: 3 – 6 METs
Vigorous intensity: > 6 METs
Sedentary activity includes watching television, reading, and sitting.
significantly different from BMI < 25 (p < .05).
significantly different from BMI: 25–29.9 (p < .05).
significantly different from before diagnosis PA levels (p < .05).