Table 1.
Mixed Methods Appraisal Tool (MMAT), version 2018 indicators for screening questions and quantitative descriptive studies (adapted from Hong et al. [44]).
Fig 1.
Flow diagram for study selection.
Fig 2.
Bar chart showing the frequency of measurement methods of the size of mastoid air cells with age in the literature from 1940 till present.
The X-axis displays measurements of air cells, and the Y-axis illustrates the number of articles.
Fig 3.
Line graph showing growth rate and size of mastoid air cell systems of studies that utilized 1 year age grouping.
X-axis displays age in years, and Y-.axis illustrates the size of the mastoid air cells.
Fig 4.
Line graph showing growth rate and size of mastoid air cell systems of studies that utilized 5 year age grouping.
X-axis displays the age range in years, and Y-.axis illustrates the size of the mastoid air cells.
Fig 5.
Line graph showing growth rate and size of mastoid air cell systems of study that utilized 10 year age grouping.
X-axis displays age range in years, and Y-.axis illustrates the volume of the mastoid air cells.
Table 2.
Table of characteristics of included studies.