We thank Joan Soriano for his helpful comments in the design of the Wellington Respiratory Survey; avrille Holt, Patricia Heuser, and Eleanore Chambers for their help in conducting the pulmonary function tests; Statistics New Zealand for assistance with occupa tional coding; Roger Newson and Philip Guangquan for advice on multiple testing corrections; and Lesley Rushton and Elizabeth Esan for discussions on occupational analyses at initial stages.