Pulmonary function, measured by means of flow-volume curve method, of the 130 healthy students of Kansai Junior High School (K-school) which was located in the area designated by the Pollution-related Health Damage Compensation Law was compared to that of the 513 healthy students of Terao Junior High School (T-school) which was located outside of that area for three successive years. Both schools were located in Tsurumi Ward of Yokohama City.
The following results were obtained:
1. On the maximal expiratory flow of V75, PFR, V75/Ht, and PFR/Ht, which are reflecting the states of central airways, those in T-school tended to have higher values than those in K-school for 3 years respectively.
2. On the values of V50, V25, V50/Ht and V25/Ht which are reflecting the states of peripheral small air ways, K-school were higher than T-school at 12-year-old group in the first year and at the all groups in the second year. But the values in T-school were conversely higher than in K-school at the all groups in the third year.
3. The frequency of subjects, who had shown high value of V50/V25 which is one of the indices to detect obstructive lung disorder, increased higher as the students grew older. The tendency was more remarkable in K-school than in T-school, but there was no significant difference.
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