Table 4.

Interobserver Agreement Observer 1 vs. Observer 3

Observer 1	Observer 3	Observed Agreement (n = 119)*	Kappa Value (95% CI)
Session 1	1	80 (67%)	0.46 (0.18 to 0.46)
	2	85 (71%)	0.41 (0.27 to 0.55)
	3	71 (60%)	0.38 (0.15 to 0.39)
Session 2	1	76 (64%)	0.37 (0.17 to 0.45)
	2	80 (67%)	0.47 (0.23 to 0.51)
	3	73 (61%)	0.44 (0.22 to 0.46)
Session 3	1	77 (65%)	0.37 (0.18 to 0.44)
	2	82 (69%)	0.45 (0.25 to 0.53)
	3	73 (61%)	0.37 (0.22 to 0.44)
Average		77 (65%)	0.41

^*Data are given as the number of disc levels, with percentage in parentheses