中证医疗指数下跌0.04%，前十大权重包含药明康德等

Group 1 - The core viewpoint of the news is that the CSI Medical Index has shown a slight decline recently, reflecting the overall performance of listed companies in the medical and healthcare sector in China [1] - The CSI Medical Index closed at 6285.16 points, with a trading volume of 13.955 billion yuan, down 0.04% [1] - Over the past month, the CSI Medical Index has decreased by 8.83%, while it has seen a slight increase of 0.12% over the last three months, and a year-to-date decline of 4.13% [1] Group 2 - The CSI Medical Index includes companies involved in medical devices, medical services, and medical information technology, with a base date of December 31, 2004, set at 1000.0 points [1] - The top ten weighted companies in the CSI Medical Index are WuXi AppTec (10.39%), Mindray Medical (9.5%), Aier Eye Hospital (8.04%), United Imaging (7.08%), Aimeike (3.67%), Huatai Medical (3.62%), Kanglong Chemical (3.16%), TigerMed (3.15%), Yuyue Medical (2.82%), and New Industry (2.74%) [1] - The market share of the CSI Medical Index is 57.96% from the Shenzhen Stock Exchange and 42.04% from the Shanghai Stock Exchange [1] - The industry composition of the CSI Medical Index shows that 97.45% is in the healthcare sector, 2.28% in information technology, and 0.27% in consumer goods [1] Group 3 - The index sample is adjusted every six months, with adjustments implemented on the next trading day following the second Friday of June and December [2] - Weight factors are adjusted in accordance with the sample adjustments, which are fixed until the next scheduled adjustment unless a special situation arises [2] - Companies that are delisted or undergo mergers, acquisitions, or splits are handled according to the calculation and maintenance guidelines [2]