Table 2

Intra-observer reliability data based on surgeon experience.

Location of stenosis	Surgeon type	Weighted Kappa	95% CI	p-value (vs. intermediate)	p-value (vs. senior)
Central	Junior	0.664 (0.062)	0.542 0.784	0.289	<0.001
	Intermediate	0.591 (0.116)	0.365 0.818		0.019
	Senior	0.265 (0.107)	0.056 0.474
Foraminal	Junior	0.716 (0.064)	0.592 0.841	0.334	0.056
	Intermediate	0.676 (0.068)	0.543 0.808		0.114
	Senior	0.539 (0.091)	0.361 0.717
Lateral	Junior	0.679 (0.054)	0.573 0.786	0.326	0.012
	Intermediate	0.715 (0.059)	0.599 0.831		0.006
	Senior	0.443 (0.090)	0.267 0.618
Overall	Junior	0.695 (0.031)	0.629 0.761	0.337	<0.001
	Intermediate	0.716 (0.039)	0.640 0.791		<0.001
	Senior	0.459 (0.057)	0.347 0.571