Table 2.

Interobserver reliabilities and kappa values

Value	L3–4	L4–5	L5–S1	<57 years	≥57 years	Total
κ	0.462	0.789	0.533	0.718	0.814	0.780
p-value	0.004	0.001	0.005	0.001	0.001	0.001

κ, kappa value: poor (κ<0.1), slight (0.1≤κ≤0.2), fair (0.2<κ≤0.4), moderate (0.4<κ≤0.6), substantial (0.6<κ≤0.8) and almost perfect (0.8<κ≤1).