Fig 1.
Age and sex distribution of the study sample.
Fig 2.
Mid-sagittal CBCT evaluation of spheno-occipital synchondrosis while the head in the default orientation.
Fig 3.
Mid-sagittal CBCT images demonstrating the spheno-occipital synchondrosis closure Stages.
Stage 0, unfused. Stage 1, fusing endocranially. Stage 2, fusing ectocranially. Stage 3, complete fusion.
Table 1.
Definition of the staging system used for scoring spheno-occipital synchondrosis closure degree.
Table 2.
Inter and intra-observer reliability.
Fig 4.
Correlation between age and spheno-occipital synchondrosis closure in males (n = 361) and females (n = 380).
Table 3.
Descriptive statistics for spheno-occipital synchondrosis closure in study population.
Fig 5.
Distribution of study population according to age, sex, and spheno-occipital synchondrosis closure Stage (median and quartile range).
See Table 3 for data.
Fig 6.
Males and females spheno-occipital synchondrosis closure rate per year (percentage).
The Scatterplot with nonlinear fit curve and 95% CI shows the data from Table 7 and Table 8.
Table 4.
Simple least square regression output for spheno-occipital synchondrosis closure.
Table 5.
Regression output for spheno-occipital synchondrosis closure in relation to age.
Table 6.
Age ranges for modern individuals based on regression analysis probability distribution (PI, prediction interval).
Fig 7.
Means and SD of spheno-occipital synchondrosis closure rate per year (percentage) in males and females, see Table 7 and Table 8 for data.
Table 7.
Spheno-occipital synchondrosis closure rate in males (percentage / year) between 9–16 years.
Table 8.
Spheno-occipital synchondrosis closure rate in females (percentage / year) between 9–16 years.
Table 9.
Menarche commencement distributions among spheno-occipital synchondrosis closure stages.