[Study on the measurement of glottic proportion in subjects with normal larynx]

Objective:The aim of this study is to explore the glottic proportion（GP） and gender difference in Chinese subjects with normal larynx. Methods:Two hundred patients with normal larynx in Sixth Medical Center of PLA General Hospital from January 2017 to December 2019 were selected as the experimental group. Group 1 included 100 females and group 2 included 100 males. Sixty patients with normal larynx in the Pontes article were selected as the control group, including 30 females as group 3 and 30 males as group 4. Results:The GP range in group 1 was 0.78-1.76, with a mean of 1.24; 0.82-2.20 in group 2, with a mean of 1.37; 0.91-1.20 in group 3, with a mean of 1.04; 1.07-1.44 in group 4, with a mean of 1.21. Statistical analysis showed that the data of the four groups were normal distribution, the standard deviation was 0.16 in group 1, 0.26 in group 2, 0.08 in group 3, 0.10 in group 4, and the test of homogeneity of variance was P<0.05. Games-Howell test was used for multi-group analysis, including group 1 and group 2, group 3 and group 4, group 1 and group 3, group 2 and group 4. The statistical results of the four groups all showed P<0.05, indicating that there were statistical differences. Conclusion:On the whole, the average GP of male group was higher than that of female, but not all males have a greater GP value than females. In the range of high GP value, males accounted for a large proportion, while in the range of low GP value, females accounted for a large proportion. In the past, most articles regard men and women as two groups to study the glottic proportion, and it was suggested that more attention should be paid to individual differences when discussing glottic proportion and related laryngeal diseases.