Association between first airborne cedar pollen level peak and pollinosis symptom onset: a web-based survey.

Cedar pollinosis in Japan affects nearly 25 % of Japanese citizens. To develop a treatment for cedar pollinosis, it is necessary to understand the relationship between the time of its occurrence and the amount of airborne cedar pollen. In the spring of 2009, we conducted daily Internet-based epidemiologic surveys, which included 1453 individuals. We examined the relationship between initial date of onset of pollinosis symptoms and daily amount of airborne cedar pollen to which subjects were exposed. Approximately 35.2 % of the subjects experienced the onset of pollinosis during a one-week interval in which the middle day coincided with the peak pollen count. The odds ratio for this one-week time interval was 4.03 (95 % confidence interval: 3.34-4.86). The predicted date of the cedar pollen peak can be used to determine the appropriate date for initiation of self-medication with anti-allergy drugs and thus avoid development of sustained and severe pollinosis.

Horizontal inequity in health care utilization in Japan.

International comparisons of horizontal inequity in health has recently become one of the most pertinent issues in health economics. However, no previous studies have been undertaken on Japan. This omission is rectified in this paper. Moreover, we consider the dynamics of horizontal inequity in health over six years from 1992 to 1998. These dynamics have never been considered in this field. In a rigorous international comparison, though we cannot find any horizontal inequity in health in 1998, we find pro-rich inequity before 1995. The reason for this may be the reform of the health insurance system in 1997.