Table 3
Changes between 1989 and 1995 in respiratory symptoms during the preceding 12 months in subjects with soybean epidemic and non-epidemic asthma (relative risk with 95% CI)
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3-150 Subjects showing “improvement” are those who answered “yes” to a symptom question in 1989 and answered “no” in 1995. Subjects showing “worsening” answered “no” in 1989 and “yes” in 1995.
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3-151 Adjusted by sex, age, and smoking.
