Background: An increasing number of patients search for medical information on the Internet if they have health problems. The reliability of the online medical information is not yet known. Baidu Encyclopedia and Wikipedia are the most widely used Chinese and English search engines. The quality of the online medical information in these websites needs to be evaluated. We perform this research study to evaluate the quality and timeliness of articles related to digestive system malignancy in articles retrieved from these encyclopedias. A 3-year follow-up was conducted to determine if the quality and timeliness of the articles improved, and comparisons were made between the 2 encyclopedias. Methods: We conducted a search of Wikipedia and Baidu Encyclopedia based on the classification codes of the International Statistical Classification of Diseases and Related Health Problems (10th revision, version 2016), and evaluated the retrieved articles related to digestive system malignancy using the DISCERN instrument. The update timeliness of these websites were evaluated by calculating the update interval of the articles.Results: In 2019 and 2022, we retrieved 50 and 52 articles, respectively, from Baidu Encyclopedia, representing an increase of 2 articles and no deleted articles, and 30 and 31 articles, respectively, from Wikipedia, representing an increase of 1 article and no deleted articles. According to the scores calculated using the DISCERN instrument, in both 2019 and 2022, Wikipedia scored higher than Baidu Encyclopedia in Sections 1 and 2, and the difference was statistically significant. The total score of Wikipedia was higher than that of Baidu Encyclopedia, and the difference was statistically significant. The update interval of Wikipedia was shorter than that of Baidu Encyclopedia with better timeliness and statistical significance. Conclusions:The quality and timeliness of the digestive system malignancy articles on Wikipedia are better than those on Baidu Encyclopedia. The quality of both the Baidu Encyclopedia and Wikipedia articles had improved over the last 3 years. However, there is still no guarantee of the comprehensiveness or reliability of the treatment information obtained from the Internet.

BACKGROUND The Internet has evolved the approaches of medical information spread. Demands of online information searching on mental disease expanded. The Wikipedia and Baidu Encyclopedia are popular information source. Websites with information on mental disease have not been systematically evaluated. OBJECTIVE The research aimed to estimate the quality of mental disease information on the internet and to evaluate all aspects including timeliness to value the information quality from Baidu Encyclopedia and Wikipedia to help users to make better choice. Besides, establishing a perfect relevant online health information examine and supervision system, in order to satisfy public self-help mental medical information service needs. METHODS We retrieved the entries on mental disease from the International Statistical Classification of Diseases and Related Health Problems 10th Revision Version 2016 codes on Wikipedia (in English) and Baidu Encyclopedia (in Chinese) in 2018 and 2021. Subject sites were accessed by DISCERN. The comparison between 2 engines as well as 3 years follow-up and timeliness were calculated. RESULTS The number of entries on mental disease we found in 2018 is 34 on Baidu Encyclopedia and 36 on Wikipedia and 37 entries on both Baidu Encyclopedia and Wikipedia in 2021. In 2018, the DISCERN score of Baidu Encyclopedia entries in section 1 and section 3 were lower than those of Wikipedia articles (11.21±4.57 vs 26.25±3.21, p<.001; 2.06±.74 vs 2.53±.94, p<.05). Significantly differences can also be found in total score and all sections in 2021 between 2 engines (total score, 26.29±11.03 vs 44.31±9.77, all 3 sections, p<.001). The DISCERN score of Wikipedia articles during 3 years showed significant increase (all 3 sections, p<.001; total, p<.001). The mean update interval varies greatly from Baidu Encyclopedia (824.79 days in 2018; 945.73 days in 2021) to Wikipedia (34.17 days in 2018;50.46 days in 2021) (p<.001). CONCLUSIONS Despite the general poor quality of mental disease entries in both two engines, Wikipedia expressed to be a better source of online mental disease information compared to Baidu Encyclopedia, with higher reliability, better treatment advice and shorter update interval. Our findings reflected the existing deficit of general website mental health information, suggested a reference for further and better medical network information order. Based on this foundation, it is essential to encourage people to seek professional help rather than believe the ambiguous source information from Internet. The quality of these entries has been improved during 3 years. This positive trend is encouraging that we can expect better online information service in the coming future.

BACKGROUND The Internet has gradually become the most important way for people to search for information. Increasing number of people searched for relevant information or even treatment plans on the Internet when they get health problem. The reliability of the medical information provided online remains to be proved. Wikipedia and Baidu Encyclopedia are the most widely used search engines in English and Chinese, respectively. The quality of the medical information they provide needs to be assessed. OBJECTIVE This study aimed to evaluate the quality and timeliness of medical information related with digestive system malignancy retrieved from Wikipedia and Baidu Encyclopedia. Comparison was made between the 2 encyclopedias. We conducted a 3-year follow-up to find out if the quality and timeliness of articles improved. METHODS We conducted a search based on International Statistical Classification of Diseases and Related Health Problems 10th Revision Version 2016 codes in Wikipedia and Baidu Encyclopedia, and evaluated articles related to digestive system malignancy by using the DISCERN instrument. We calculated the update interval of the webpages to evaluate the update timeliness of these websites. RESULTS In 2017 and 2020, we searched out a total of 50 and 52 articles from Baidu Encyclopedia, with 2 articles increased and no article missed. 30 and 32 articles were found in Wikipedia, with 1 article increased and no article missed. According to the scores evaluated by DISCERN instrument. In both 2017 and 2020, Wikipedia scored higher than Baidu Encyclopedia in section1 and section2, and it's statistically significant. Wikipedia scored higher than Baidu Encyclopedia in Section3, but it's not statistically significant. The total score of Wikipedia was higher than Baidu Encyclopedia, and the difference was statistically significant. The update interval of Wikipedia is shorter than that of Baidu Encyclopedia, with better timeliness and statistical significance. CONCLUSIONS The quality and timeliness of digestive system malignancy relative articles on Wikipedia are better than those on Baidu Encyclopedia. Both Baidu Encyclopedia and Wikipedia articles have improved in quality over the past three years. However, the treatment information obtained from the Internet still can’t guarantee its comprehensiveness or reliability. Patients should consult a medical professional directly.