Table 1.
Demographic characteristics of population.
| Characteristic | Agricultural worker | Nonagricultural worker | Overall | Significance of difference between agricultural and nonagricultural workersa |
|---|---|---|---|---|
| Total no. of subjects (%) | 53 (51.5) | 50 (48.5) | 103/112 | (9 unknown status) |
| Ever smokedb | 32 (60.4) | 26 (52.0) | 58 (56.3) | Not significant |
| χ2 = 0.74 | ||||
| p = 0.39 | ||||
| Age (years) | 35 ± 14.2 | 30 ± 10.5 | 32.5 ± 12.8 | χ2 = 3.18 |
| p = 0.075 | ||||
| Years education | 5.6 ± 3.2 | 10.1 ± 2.8 | 8.1 ± 3.7 | χ2 = 35.8 |
| p ≤ 0.0001 | ||||
| Years in Fresno County | 11.9 ± 11.0 | 17.2 ± 12.0 | 14.95 ± 11.9 | χ2 = 5.98 |
| p = 0.0145 |
Values are no. (%) or mean ± SD unless noted otherwise. All subjects were male and Hispanic (total n = 112).
a
Chi-square categorical tests used except for age and years of education, where the Kruskal–Wallis test giving a chi-square value was used.
b
Based on histologic criteria (see text).