International Journal of Epidemiology 2000;29:661-666
© International Epidemiological Association 2000
Relationship between intraocular pressure and obesity in Japan
a Research Center of Health, Physical Fitness and Sports, Nagoya University, Nagoya, Japan.
b Department of Epidemiology, National Institute for Longevity Sciences, Obu, Aichi, Japan.
Reprint requests to: Keiko Mori, Department of Living Science, Chukyo Junior College, 2216 Toki-cho, Mizunami-shi, Gifu, 509–6192 Japan.
Background Some cross-sectional studies have suggested that age, systolic blood pressure and obesity are positively related to intraocular pressure (IOP), but few longitudinal studies have examined this relationship. This study was carried out to evaluate the association between intraocular pressure and obesity by cross-sectional and longitudinal analyses in a large Japanese population.
Methods Data were collected from annual health examinations between 1989 and 1997 and reviewed retrospectively. Subjects of the cross-sectional analysis were 70 139 males and females aged 14–94 years. Among these subjects, 25 216 males and females who had undergone IOP measurements more than three times were analysed longitudinally. The association between IOP and obesity was examined cross-sectionally and longitudinally.
Results Cross-sectional analysis: The mean IOP at the last visit was 11.6 mmHg. The IOP decreased gradually with age and was significantly higher in males than in females in almost all age groups. Body mass index (BMI) significantly correlated with IOP after controlling for age, gender and blood pressure. Longitudinal analysis: There was a significant association between longitudinal change in IOP and change in weight. This relationship remained significant after controlling for initial BMI, initial blood pressure, change in blood pressure, gender and age.
Conclusion This study showed a significant association between IOP and obesity in both cross-sectional and longitudinal analysis. These findings suggest that obesity is an independent risk factor for increase in IOP.
Keywords Intraocular pressure, obesity, cross-sectional analysis, longitudinal analysis, blood pressure, Japanese population
Accepted 17 December 1999
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