(187-200.) Choi BS. Lung function test for workers and its quality control program. Korean J Occup Environ Med 1994,

(.2000) Study of normal predictive reference for healthy Korean adults. Occupational Safety and Health Research Institute,

(amrevrespirdis1976) variability and effects of age,

(pirdis1983) Changes in the normal maximal expiratory flow- volume curve with growth and aging,

selection of reference values and interpretative strategies. Am Rev Respir Dis 1991,

American Thoracic Society. Snowbird workshop on standardization of spirometry. Am Rev Respir Dis 1979,

(1999) Spirometric reference values from a sample of the general U,

(1987update.amrevrespirdis1987) American Thoracic Society. Standardization of spir�,

(amrevrespirdis1971) ards for healthy nonsmoking adults,

(1995) . Standardization of spirometry : 1994 update,

(amjmed1961) The Veterans Administration-Army cooperative study of pulmonary function clinical spirometry in normal men,

(1984) Study on the normal predicted standard of spirometry health nonsmoking Korean adults,

(2002) Normative values of pulmonary function testing in Chinese adults.,

(1990) The effect of aging on the pulmonary function of the healthy adults,

Gardner RM. Reference spirometric values using techniques and equipment that meet ATS recommendations. Am Rev Respir Dis 1981,

(1994) Prediction formulas of pulmonary function parameters derived from forced expiratory spirogram for healthy nonsmoking and smoking adults and effect of smoking on pulmonary function parameters,

(1994) Normal predictive values of FVC and FEV1 for healthy Korean male workers,