Reference Spirometric Values for Healthy Lifetime Nonsmokers in Thailand
ARTH NANA, M.D.*,
WANCHAI DEJSOMRITRUTAI, M.D.*,
KHUN NANTA MARANETRA, M.D.*,
KITTIPONG MANEECHOTESUWAN, M.D.*,
NITIPATANA CHIERAKUL, M.D.*,
JAMSAK TSCHEIKUNA, M.D.*,
T ASNEEY A SUTHAMSMAI, M.Sc. *,
BENJAMAS CHUA YCHOO, M.D.*,
PHUNSUP WONGSURAKIAT,M.D.*,
SUCHAI CHAROENRATANAKUL, M.D.*,
WILA WAN JUENGPRASERT, M.D.**,
CHANA NARUMAN, M.Sc.*
Affiliation : * Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700,
* Ministry of Public Health, Nonthaburi 11000, Thailand.
t This study was supported by a grant from the Ministry of Labor and Social Welfare.
AbstractThe normal spirometric reference values for Thai people are still not yet available. The
aim of this study was to establish standard spirometric equations for Thai people. Subjects I 0
years of age and over were selected and their demographic distributions represented that of the
population of the whole country. Inclusion criteria were strictly lifetime nonsmokers, no history of
chronic cardiopulmonary disease (using a modified ATS - OLD 78 respiratory adult questionnaire).
normal standard chest radiograph and unremarkable physical examination. They had to be without
respiratory symptoms at the time of the study. Spirometric values were obtained by 5 turbine system
'Pony graphic' (Cosmed, Italy) spirometers which met ATS recommendations. A normal group
of 2299 women and 1655 men were selected. Regression analyses using sex, height and age as
independent variables were used to provide equations for predicted values.
Keywords : Spirometry, Reference, Standard, Thailand, Pulmonary Function Test
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