Chatterjee D, Ghosh T B, Ghosh B B
J Laryngol Otol. 1990 Aug;104(8):603-5. doi: 10.1017/s0022215100113349.
A radiographic planimetric study of mastoid air cell system was carried out on 100 normal human subjects of which 50 were males and 50 females--who were further subdivided into five age groups. They had no history of past ear disease or any other clinical ENT abnormality. The mean area of the mastoid air cell system was measured planimetrically on X-rays and the data analysed according to age and sex. It was 12.05 +/- 0.67 cm2 in males and 11.45 +/- 0.70 cm2 in females (which are more or less the same as that of Western people). The size of the cranial bones has no apparent role in the size variation of the mastoid air cell system. The development of the latter was very rapid up to 10 years of age in both sexes and it continued even after 20 years of age but at a much slower rate.
对100名正常受试者的乳突气房系统进行了X线平面测量研究，其中男性50名，女性50名，他们又被进一步分为五个年龄组。这些受试者既往无耳部疾病史或任何其他耳鼻喉科临床异常情况。通过X线平面测量法测量乳突气房系统的平均面积，并根据年龄和性别对数据进行分析。男性的平均面积为12.05±0.67平方厘米，女性为11.45±0.70平方厘米（与西方人大致相同）。颅骨大小在乳突气房系统大小变化中无明显作用。乳突气房系统在两性中直到10岁时发育非常迅速，甚至在20岁以后仍在继续发育，但速度要慢得多。
