Table 2.

Pearson correlation between every two parameters in the CMI group.

Correlation		Cerebellar tonsillar hernia	Syrinx expansion		PCF		CSF dynamic
		Tonsils descent (mm)	Syrinx length	VI	PCF CI	Bony-PFV (ml)	PVmax (cm/s)	NVmax (cm/s)	absMV (cm/s)
Syrinx expansion	Syrinx length	r = 0.029; P = 0.863
	VI	r = 0.007; P = 0.966	r = 0.575; P = 0.000***
PCF	PCF CI	r = 0.319A; P = 0.027*	R = 0.215; P = 0.209	r = −0.157; P = 0.328
	Bony-PFV (ml)	r = −0.014; P = 0.960	r = 0.270; P = 0.372	r = −0.384D; P = 0.021*	r = −0.468; P = 0.001**
CSF dynamic	PVmax (cm/s)	r = 0.036; P = 0.796	r = 0.184; P = 0.424	r = −0.169; P = 0.411	r = 0.295G; P = 0.042*	r = −0.301; P = 0.186
	NVmax (cm/s)	r = 0.051; P = 0.809	r = −0.032; P = 0.892	r = 0.247; P = 0.280	r = 0.076; P = 0.724	r = 0.253; P = 0.268	r = −0.860; P = 0.000***
	absMV (cm/s)	r = −0.303B; P = 0.036*	r = 0.159; P = 0.315	r = 0.326E; P = 0.031*	r = 0.289H; P = 0.046*	r = 0.199; P = 0.414	r = 0.511; P = 0.011*	r = −0.337; P = 0.108
	Net flow (ml)	r = −0.300C; P = 0.038*	r = 0.055; P = 0.823	r = 0.505F; P = 0.046*	r = −0.292I; P = 0.044*	r = 0.105; P = 0.787	r = 0.023; P = 0.923	r = 0.624; P = 0.7938	r = 0.9256; P = 0.000***

^ACerebellar tonsillar hernia associated with PCF CI,

^Bcerebellar tonsillar hernia associated with absMV,

^Ccerebellar tonsillar hernia associated with CSF net flow,

^Dbony-PFV associated with VI.

^EabsMV associated with VI,

^FCSF net flow associated with VI,

^GPVmax associated with PCF CI,

^HabsMV associated with PCF CI,

and

^IPCF CI associated with CSF net flow.

^*P < 0.05;

^**P < 0.01;

^***P < 0.001.