Table 2.
Risk for biopsy-confirmed BBD in young women (133 cases and 6901 non-cases) related to physical activities and inactivity at age 14yr. All models adjust for baseline age and baseline BMI.
| Never Reported Biopsy-Confirmed | Continuous Risk Factors | Highest vs Lowest Categorya | ||||
|---|---|---|---|---|---|---|
| BBD | BBD cases | Age-BMI-adj | Multivar-adjusted | Age-BMI-adj | Multivar-adj | |
| Mean (SD) | Mean (SD) | OR (95%CI) | OR (95%CI) | OR (95%CI) | OR (95%CI) | |
| Physical Activities and Inactivity at age 14yr | ||||||
| Mod &vigorous (hrs/day) | 1.66 (1.13) | 1.81 (1.18) | 1.09 (.94–1.27) | 1.09b(.93–1.28) | 1.65 (.87–3.12) | 1.84b(.96–3.55)* |
| Walking (hrs/day) | 0.33 (.38) | 0.30 (.40) | 0.80 (.49–1.30) | 0.80b(.47–1.34) | 0.66 (.41–1.06)* | 0.61b(.37–.99)** |
| Total Mets/day | 11.86 (7.84) | 12.65 (7.78) | 1.01 (.99–1.03) | 1.01c(.99–1.03) | 1.20 (.80–1.81) | 1.19c(.78–1.82) |
| Inactivity (hrs/day) | 2.58 (1.62) | 2.49 (1.40) | 0.98 (.88–1.10) | 0.96b(.85–1.09) | 1.02 (.67–1.55) | 1.02b(.67–1.56) |
| (TV, videos, computer/videogames) | ||||||
For moderate/vigorous physical activity, top vs bottom is ≥2hrs/day vs ≤30min/day. For walking, top vs bottom is ≥30min/day vs ≤15 min/day. For METS, comparison is top vs bottom tertile. For inactivity, top vs bottom is ≥3hrs/day vs <2 hrs/day.
From multivariable models including age 14yr moderate/vigorous activity, walking, inactivity, intakes of peanut butter/nuts, total energy intake, adolescent alcohol consumption, pregnancy history, age at menarche, and family history of breast disease.
From multivariable models including age 14yr total METS, inactivity, intakes of peanut butter/nuts, total energy intake, adolescent alcohol consumption, pregnancy history, age at menarche, and family history of breast disease.
P<0.10
P<0.05