Table 5.
Subgroup associations (HR (95% CI))a between baseline LAN and incidence of all thyroid cancer.
| No. of thyroid cancer cases | LAN in 1996 | p-trend | p-interaction | |||||
|---|---|---|---|---|---|---|---|---|
| Q1 | Q2 | Q3 | Q4 | Q5 | ||||
| Age | 0.56 | |||||||
| <62 | 438 | Ref | 1.22 (0.88, 1.69) | 1.36 (0.97, 1.89) | 1.73 (1.24, 2.40) | 1.73 (1.17, 2.53) | 0.001 | |
| ≥62 | 418 | Ref | 1.12 (0.81, 1.55) | 1.21 (0.87, 1.68) | 1.33 (0.96, 1.86) | 1.41 (0.97, 2.05) | 0.04 | |
| Race | 0.81 | |||||||
| White | 790 | Ref | 1.11 (0.88, 1.41) | 1.25 (0.99, 1.59) | 1.49 (1.17, 1.90) | 1.55 (1.17, 2.05) | 0.0002 | |
| Non-whiteb | 66 | Ref | 3.89 (0.85, 17.86) | 2.49 (0.52, 11.97) | 2.99 (0.65, 13.71) | 2.45 (0.53, 11.33) | 0.80 | |
| Blacks | 41 | Ref | 3.92 (0.45, 33.96) | 3.50 (0.40, 30.67) | 3.29 (0.39, 27.88) | 2.37 (0.28, 20.24) | 1.00 | |
| Education | 0.28 | |||||||
| HS graduate or lower | 215 | Ref | 1.36 (0.89, 2.06) | 1.22 (0.77, 1.93) | 1.16 (0.72, 1.87) | 1.52 (0.90, 2.57) | 0.28 | |
| Some college or higher | 602 | Ref | 1.11 (0.83, 1.48) | 1.24 (0.94, 1.65) | 1.60 (1.21, 2.12) | 1.63 (1.18, 2.25) | 0.0002 | |
| Poverty rate at census tract | 0.61 | |||||||
| < 6.3% | 457 | Ref | 1.09 (0.78, 1.52) | 1.35 (0.97, 1.88) | 1.58 (1.12, 2.24) | 1.88 (1.25, 2.82) | 0.0003 | |
| ≥ 6.3% | 399 | Ref | 1.26 (0.91, 1.74) | 1.17 (0.82, 1.66) | 1.48 (1.06, 2.08) | 1.33 (0.92, 1.93) | 0.08 | |
a
Adjusted for variables in Model 2 (age, sex, race, education, marital status, state of residence and median home value, poverty rate and population density at census tract level).
b
Included blacks, Hispanics and Asian, Pacific Islander, Native American combined.
Abbreviations: CI, confidence interval; LAN, light at night; HR, hazard ratio.