Table 1.
Baseline characteristics of breast cancer survivors by insomnia scores (N = 2960).
| Insomnia Score < 9 | Insomnia Score ≥ 9 | ||
|---|---|---|---|
| n = 1812 | n = 1148 | p-Value | |
| Pessimism a | 6.0 (4.0, 7.0) | 6.0 (5.0, 8.0) | <0.0001 |
| KCAL a | 1685.0 (1431.0, 1979.5) | 1703.5 (1450.0, 1988.5) | 0.30 |
| PRAL a | −4.2(−13.9, 4.4) | −3.0 (−13.4, 5.5) | 0.02 |
| NEAP a | 39.6 (32.3, 48.3) | 40.6 (32.8, 48.8) | 0.06 |
| Age at Diagnosis (years) a | 50 (45, 57) | 50 (45, 57) | 0.48 |
| Normal Weight, N (%) | 801 (62.9) | 472 (37.1) | 0.07 |
| White, N (%) | 1545 (61.1) | 983 (38.9) | 0.79 |
| Stage at Diagnosis | |||
| I, N (%) | 698 (69.0) | 447 (39.0) | 0.80 |
| II, N (%) | 1019 (61.2) | 647 (38.8) | |
| III, N (%) | 95 (63.8) | 54 (36.2) | |
| Intervention Group, N (%) | 929 (63.0) | 546 (37.0) | 0.05 |
| Hormone Receptor Status | |||
| ER+/PR+, N (%) | 1109 (60.3) | 729 (39.7) | 0.35 |
| Post-Menopause, N (%) | 1398 (59.4) | 954 (40.6) | <0.0001 |
| Chemotherapy, N (%) | 1266 (61.4) | 797 (38.6) | 0.92 |
| Radiation, N (%) | 1112 (61.2) | 704(38.8) | 0.85 |
| Smoking Status | |||
| Never N, (%) | 988 (62.0) | 606 (38.0) | 0.48 |
| Past N, (%) | 739 (60.0) | 493 (40.0) | |
| Current N, (%) | 85 (63.4) | 49 (36.6) | |
| Education | |||
| Some College or above N, (%) | 1015 (63.5) | 584 (36.5) | 0.006 |
| Alcohol Abstainer N, (%) | 571 (61.4) | 359 (38.6) | 0.97 |
a Continuous variables are presented as median (inter-quartile range). To test statistical significance between women with insomnia symptoms vs. those without insomnia symptoms, we used a t-test for a continuous variable (variables labeled with a, such as pessimism) and chi-squared test for a categorical variable (variables not labeled with a, such as education). Abbreviations: KCAL: Kilo Calorie, ER.: estrogen receptor-positive, PR: progesterone receptor-positive; PRAL potential renal acid load, NEAP net endogenous acid production.