Morbidity data
Hospital admissions data of respiratory system diseases
are considered as health endpoints. Lacking access to
data of morbidity rate of respiratory system diseases in
Lanzhou, this rate is calculated in accord with ratios of
national hospital admissions for respiratory system diseases
from the Chinese Ministry of Health. Methods
International classification (ICD-10) was adopted to pro-
vide the scientific basis for statistical analysis to calculating
the disease composition. Specific classification
standard is ICD-10:J00-99. Diseases of the information
collected are from each hospital database.