Table 3.
Mean values of lipid biomarkers by levels of shift work, stratified by gender; BCOPS 2004–2009
| Day | Afternoon | Night | p | |
|---|---|---|---|---|
| Women | n = 68 | n = 17 | n = 14 | |
| Triglycerides | ||||
| Model 1 | 63.5 (55.6–72.6) | 71.0 (54.4–92.6) | 75.0 (55.9–100.7) | 0.551 |
| Model 2 | 61.0 (53.2–69.9) | 65.1 (49.5–85.7) | 69.5 (51.6–93.5) | 0.718 |
| Total cholesterol | ||||
| Model 1 | 189.8 ± 4.5 | 206.0 ± 9.0 | 199.5 ± 10.0 | 0.276 |
| Model 2 | 187.7 ± 4.7 | 201.6 ± 9.4 | 195.6 ± 10.2 | 0.394 |
| HDL cholesterol | ||||
| Model 1 | 56.6 ± 1.9 | 66.5 ± 3.8 | 55.6 ± 4.2 | 0.055 |
| Model 2 | 55.3 ± 1.9 | 63.7 ± 3.9 | 53.2 ± 4.2 | 0.084 |
| LDL cholesterol | ||||
| Model 1 | 117.8 ± 3.9 | 124.5 ± 7.9 | 127.5 ± 8.7 | 0.550 |
| Model 2 | 117.9 ± 4.1 | 124.7 ± 8.3 | 127.7 ± 9.0 | 0.555 |
| Men | n = 73 | n = 112 | n = 76 | |
| Triglycerides | ||||
| Model 1 | 120.0 (102.3–140.9) | 124.5 (110.0–140.8) | 128.2 (110.1–149.2) | 0.851 |
| Model 2 | 110.2 (93.7–129.6) | 104.3 (90.6–120.0) | 108.3 (91.9–127.8) | 0.845 |
| Total cholesterol | ||||
| Model 1 | 207.6 ± 4.7 | 204.9 ± 3.6 | 204.2 ± 4.5 | 0.868 |
| Model 2 | 202.9 ± 4.8 | 196.6 ± 4.2 | 195.4 ± 4.9 | 0.483 |
| HDL cholesterol | ||||
| Model 1 | 44.1 ± 1.5 | 41.2 ± 1.1 | 41.6 ± 1.4 | 0.279 |
| Model 2 | 44.0 ± 1.5 | 40.8 ± 1.3 | 41.2 ± 1.6 | 0.243 |
| LDL cholesterol | ||||
| Model 1 | 133.1 ± 4.2 | 133.5 ± 3.3 | 131.8 ± 4.0 | 0.942 |
| Model 2 | 130.3 ± 4.4 | 129.8 ± 3.8 | 127.1 ± 4.5 | 0.842 |
Shift work refers to the dominant shift in the past 1 year.
The p values were obtained from ANCOVA.
Results for triglycerides were first log-transformed then back-transformed for reporting. Results for triglycerides are means (95% CI); all other results are means ± SE.
Model 1: adjusted for age.
Model 2: adjusted for age and race/ethnicity.
Interaction by gender in the association of shift work and HDL cholesterol is significant: p = 0.009.
ANCOVA, analysis of covariance; BCOPS, Buffalo Cardio-metabolic Occupational Police Stress; CI, confidence interval; HDL, high-density lipoprotein; LDL, low-density lipoprotein; SE, standard error.