Table 2.
The distributions of age of diagnosis, duration of dust exposure and latent period of CWP in different eras of diagnosis.
| Time Range | N | Age of Diagnosis | Duration of Dust Exposure (yrs) | Latent Period (yrs) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean ± SD | Median | Range | Mean ± SD | Median | Range | Mean ± SD | Median | Range | ||
| <1980 | 91 | 41.4 ± 7.16 | 40.0 | 29.0–66.0 | 21.8 ± 7.5 | 20.1 | 8.4–46.7 | 21.5 ± 7.2 | 20.0 | 9.0–46.0 |
| 1980– | 69 | 45.8 ± 8.2 a | 44.0 | 28.0–71.0 | 25.2 ± 8.0 a | 24.3 | 8.7–51.4 | 25.2 ± 7.7 a | 24.0 | 8.0–51.0 |
| 1990– | 229 | 50.8 ± 9.5 a,b | 51.0 | 27.0–80.0 | 26.6 ± 7.8 a | 27.0 | 6.0–45.0 | 29.8 ± 9.3 a,b | 30.0 | 7.0–60.0 |
| 2000– | 106 | 60.0 ± 10.9 a,b,c | 59.0 | 37.0–81.0 | 32.0 ± 8.5 a,b,c | 33.0 | 6.5–55.0 | 37.6 ± 11.6 a,b,c | 35.5 | 8.0–57.0 |
| F | 72.808 | 28.140 | 54.316 | |||||||
| p | <0.0001 | <0.0001 | <0.0001 | |||||||
a p < 0.05 compared with years of diagnosis before 1980; b p < 0.05 compared with 1980–; c p < 0.05 compared with 1990–.