Table 1.
Distribution of select factors, by shift status, among female participants included in the analysis of shift work in association with genome-wide DNA methylation as measured in blood.
| Dayshiftn (%) | Nightshiftn (%) | |
|---|---|---|
| Agea,b | ||
| 22–29 | 19 (22) | 36 (33) |
| 30–36 | 20 (23) | 27 (24) |
| 37–42 | 28 (33) | 27 (24) |
| 43–48 | 19 (22) | 21 (19) |
| Body Mass Index [(lbs/in2)×703]a,c | ||
| 17.9–21.5 | 27 (31) | 23 (21) |
| >21.5–23.4 | 22 (26) | 27 (24) |
| >23.4–25.5 | 17 (20) | 32 (29) |
| >25.5–29.4 | 20 (23) | 29 (26) |
| Race | ||
| White | 72 (84) | 81 (73) |
| Other | 14 (16) | 30 (27) |
| Smoking | ||
| No | 80 (93) | 104 (94) |
| Yes | 6 ( 7 ) | 7 ( 6 ) |
| Alcohol | ||
| No | 58 (67) | 103 (93) |
| Yes | 28 (33) | 8 ( 7 ) |
| Months engaged in current shift schedule (months)d | ||
| 6-<12 | 13 (15) | 21 (19) |
| 12-<24 | 26 (30) | 33 (30) |
| 24-<54 | 21 (25) | 34 (31) |
| ≥ 54 | 26 (30) | 23 (20) |
| Proportion of blood cell types (means) | ||
| B-cells | 0.04 | 0.05 |
| CD8 T-cells | 0.10 | 0.10 |
| CD4 T-cells | 0.13 | 0.14 |
| Natural Killer cells | 0.04 | 0.04 |
| Granulocytes | 0.62 | 0.65 |
| Monocytes | 0.10 | 0.11 |
a
Age and BMI categories based on quartiles among all 197 participants included in shift work analysis.
b
Mean (Standard Deviation) for Age: Dayshift = 35.9 (7.0); Nightshift = 34.4 (7.4).
c
Mean (Standard Deviation) for Body Mass Index: Dayshift = 23.0 (2.6) ; Nightshift = 23.8 (2.7).
d
Mean (Standard Deviation) for Months engaged in current shift schedule: Dayshift = 46.4 (47.9); Nightshift = 36.8 (36.1).