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140 Chapter 8 Figure 4. Expected tonsil position across age by 3 different covariate values. Expected tonsillar position and corresponding 95% CI across age, by specific covariate values: Tonsil position by FOHR (A); Tonsil position by head circumference (B); Tonsil position by lambdoid suture before the age of 1 year (C). Variables that are not shown in a particular panel were set to reference/ median values (FOHR: 0.37, headcircumference: 0.51 SD, lambdoid sutures: open). Closed Lambdoid Sutures and Head-circumference Figure 3 B, C display the corresponding plots of FOHR for the scenario in which headcircumference varies between its Q1 and Q3, and lambdoid suture closure at the age of less than 1 year is present, or not present. Increase in head-circumference was associated with an increase in FOHR (see Table 2, head-circumference: odds ratio = 1.102 (95% CI[1.063–1.140]). There was no clear evidence for differences in FOHR depending on whether patients presented with closed lambdoid sutures at the age of less than 1 year. Figure 4 B, C shows the corresponding effects on tonsil position for the scenarios in which head-circumference varied between Q1 and Q3, and lambdoid suture closure before 1 year of age was present or not present. Table 3 shows that there was no evidence for an association between tonsil position and head-circumference. Closed lambdoid sutures before 1 year of age were associated with a +6.990mm increase in tonsil position (95% CI [3.614–10.276]).

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