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Objective: To compare endoscopic myringoplasty using the cartilage-perichondrium complex as a graft (test group) with temporalis fascia microscopic myringoplasty (control group).Study Design: A retrospective cohort study.Setting: Department of Otorhinolaryngology in a tertiary Chinese hospital.Methods: Data were collected on patients between 2017 and 2019. To balance the baseline characteristics between groups, we performed a propensity score-matched analysis, and 44 patients were included in each group. Hearing improvement and eardrum closure rates were compared, and risk factors affecting them were analyzed.Results: In the control and test groups, 90.90% and 86.36% of patients had a mean air-bone gap ≤20 dB after the surgery, respectively (P = .843). The air conduction (AC) threshold gain at each frequency was similar in the 2 groups (P > .05). The closure rates were 95.45% and 93.18%, respectively (P = .645). The air-bone gap improved significantly after surgery, F(1, 61) = 6.729, P = .012. Age, group, middle ear mucosal status, and location of the perforation did not affect the change in air-bone gap or the drum closure rate (P > .05). However, there was an interaction between the change in air-bone gap and the size of the perforation, F(1, 61) = 11.067, P = 0001.Conclusion: Endoscopic myringoplasty using a cartilage-perichondrium complex graft is comparable with traditional surgery. Age, location of the perforation, and middle ear mucosal status did not significantly affect the change in air-bone gap or the drum closure rate. A perforation size ≥50% was always associated with a better air-bone gap improvement. [ABSTRACT FROM AUTHOR]

This study is concerned with the problem of stability analysis of two‐dimensional (2D) discrete‐time Roesser systems with time‐varying delays. First, based on an augmented Lyapunov–Krosovskii functional, a less conservative stability criterion incorporating time‐varying terms is established by utilising a general free‐matrix‐based inequality. Next, in order to eliminate the time‐varying terms without introducing redundant constraints, a quasi‐convex combination method is proposed. Then, compared with the criteria derived via the other inequalities, the conservatism analysis is given to prove the proposed criterion can lead to a better result theoretically. Finally, a numerical example is presented to illustrate the advantage of the presented method. [ABSTRACT FROM AUTHOR]