| Purpose:To determine the 5-year cumulative incidence of pterygium and its associated predictors in the Bai Chinese population who were aged 50 years and older in a rural community in Dali city of Yunnan province, China.Methods:A population-based survey was conducted in 2010,including the study of pterygium prevalence. In 2015, the study was repeated by inviting all subjects who had participated in the baseline survey in 2010. This population-based study included 2133 subjects aged 50 years or older in 2010 and was repeated in 2015 with 1520 subjects (71.3%) participating in the follow-up examination. Participants with pterygium in either eye in 2010 were excluded from the analysis related to incidence. Anterior segment examination was performed without pupil dilation using a slit lamp.Used the SPSS statistical analysis to found out the Five-Year Incidence and Predictors for Pterygium in Bai minority people.Results:Among all 2133 participants who had participated in the baseline examination in 2010, 1520 people were success-fully reexamined in 2015, representing for a 71.3% follow-up rate of the original cohort. The mean age of the study participants in the follow-up survey was 63.5 ± 8.3 years. Of the 1520 participants in 2015,941 subjects were without pterygium in either eye in 2010. An incident pterygium was detected in 64/941 adults(6.8%; 95% CI,5.2-8.4). In 43 (67.2%) of the 64 subjects, the incident pterygium had occurred unilaterally, whereas in 21 (32.8%) subjects, the incident pterygium had developed bilaterally. The 5-year cumulative incidence of pterygium was 6.8%and was significantly higher in women compared with men (8.8% vs.3.8%; P= 0.003). The age-specific incidence was 7.7%,6.5%, and 5.6% in those aged 50-59,60-69,70 years, or older at the baseline, respectively. Outdoor occupation was the only predictor, which remained to be significantly associated with a higher incidence of pterygium in multivariate analysis (odds ratio= 2.52,95% CI, 1.27-4.95). The predictive effect of outdoor occupation on incident pterygium was moderate with an area under the curve in the receiver operating characteristic analysis of 0.59 (95% CI,0.53-0.66). The trend test revealed that a linear trend of age with incident pterygium was not significant. Women were more likely to develop pterygium during the 5-year follow-up period when comparing the crude incidence. In the multivariate analysis adjusting for outdoor occupation, the association between sex and incident pterygium disappeared.Other factors such as hypertension, diabetes, and alcohol intake were not significant associates.Conclusions:The incidence of pterygium in this rural cohort of Bai minority population was higher compared to a previous report in Chinese in urban areas. Outdoor occupation was the only predictor that remained to be significantly associated with a higher incidence of pterygium in this cohort. Other factors such as age, sex, education, stature, weight, hypertension, diabetes, smoking and alcohol intake were not significant associates. The findings are important for health policy makers to project future burden of pterygium and make proper decisions on health resource allocation. We should be made to educate outdoor workers to wear sunglasses and brimmed hats to avoid of unnecessary sunlight exposure and strong wind irritate. |
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