Annual decline in spirometric indices according to exposure category
| Spirometric indices | Category of exposure condition (number of subjects) | |||||||
| Control | Exposed | Statistical test of the mean values* | ||||||
| (n=217) | Total | TPD | DDM | MTN | RCL | P values | ||
| (n=477) | (n=175) | (n=145) | (n=150) | (n=7) | Unadjusted | Adjusted† | ||
| ΔFVC/HT2 (mL/m2) | −6.2 (21.4) | −4.0 (19.1) | −0.7 (25.8) | −2.5 (12.5) | −9.0 (14.3) | −5.8 (13.3) | 0.19 | 0.5 |
| ΔFEV1/HT2 (mL/m2) | −8.8 (16.3) | −7.5 (13.9) | −6.5 (16.3) | −7.3 (10.7) | −9.0 (12.5) | −6.7 (32.6) | 0.33 | 0.3 |
Values are the arithmetic means and SD at the point of baseline survey.
†*Comparison between the control and the exposed as a whole.
†Adjusted for age, sex and smoking habit at the baseline.
DDM, machine design and development; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; H2, height-squared; MTN, maintenance; RCL, recycling; TPD, toner production.