No significant difference was observed in % predicted
values of forced vital capacity (FVC), forced expiratory
volume in 1 second (FEV1), FEV1/FVC, peak
expiratory flow (PEF) and maximal mid expiratory volume
(FEF25-75) between the photocopier operators and
control subjects (Figure 2). Sub group analysis among
non smokers did not reveal any significant difference
between the two groups.