The exposed group was significantly heavier thanthe unexposed (P<0.001). When the subjects werefully matched the anthropometric parameters of bothgroups were identical. The lung function parameters are presented intable 2. These parameters did not differ significantlybetween the exposed and unexposed groups whenthe subjects were unmatched. Following thematching of the subjects, the vital capacity(P<0.001) and FEV1% (P<0.005) fell significantly inthe exposed group compared to the unexposed whilethe forced vital capacity and the peak expiratoryflow rate (PEFR) did not differ significantly
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