Table 1 Age-standardised characteristics of 3682 breast cancer participants at post diagnosis (at sleep assessment)
Hours of sleep per night | ||||
|---|---|---|---|---|
⩽6 h ( n =965) | 7 h ( n =1234) | 8 h (reference) ( n =1100) | ⩾9 h ( n =383) | |
Age, mean (s.d.)a | 67.2 (9.2) | 66.0 (9.6) | 67.6 (8.9) | 69.3 (8.6) |
Census tract incomeb | 64 (25) | 65 (25) | 64 (24) | 63 (24) |
Duration of OC use (years) | 1.7 (3.2) | 2.0 (3.4) | 2.1 (3.6) | 1.8 (3.4) |
Caffeine intake (mg per day) | 171.3 (168.7) | 172.9 (163.3) | 174.7 (167.0) | 161.9 (161.6) |
Total caloric intake (kcal per day) | 1684 (528) | 1699 (521) | 1723 (527) | 1761 (534) |
Physical activity (met-h per week) | 14.9 (19.7) | 15.5 (18.2) | 14.8 (19.0) | 13.5 (18.6) |
BMI (kg m−2) | 26.9 (5.3) | 26.1 (5.0) | 26.5 (5.1) | 27.1 (5.6) |
Alcohol intake (g per day) | 5.6 (10.5) | 5.3 (9.5) | 6.0 (11.4) | 6.6 (13.5) |
Time between diagnosis and sleep assessment (years) | 1.7 (1.1) | 1.7 (1.1) | 1.8 (1.2) | 1.7 (1.1) |
Education (RN degree), % | 75.9 | 69.9 | 71.9 | 78.2 |
Married/in a relationship | 69.6 | 72.5 | 76.2 | 76.2 |
Ever parous | 91.1 | 93.7 | 93.1 | 94.3 |
Postmenopausal | 95.3 | 94.9 | 94.9 | 94.8 |
Ever used PMH | 56.6 | 61.1 | 61.5 | 57.3 |
Family history of breast cancer | 24.4 | 21.6 | 23.1 | 19.3 |
Prevalent diabetes or heart disease | 12.8 | 12.6 | 13.6 | 15.4 |
Current smoker | 7.8 | 9.3 | 9.2 | 8.1 |
Cancer stage I | 65.3 | 65.5 | 65.8 | 61.2 |
Cancer stage II | 28.4 | 26.1 | 24.9 | 27.6 |
Cancer stage III | 6.3 | 8.4 | 9.3 | 11.2 |
Mastectomy | 49.6 | 46.8 | 45.8 | 49.2 |
Chemotherapy | 45.5 | 42.8 | 45.3 | 44.2 |
Radiation therapy | 68.9 | 71.0 | 72.4 | 68.8 |
Hormone therapy | 80.9 | 83.2 | 82.5 | 73.2 |
ER+ or PR+ | 86.8 | 83.8 | 84.6 | 80.9 |
