European guidelines on quality criteria for diagnostic radiographic images of the lumbar spine – an intra- and inter-observer reproducibility study

Table 1 Inter-observer agreement for general image quality assessment of the lumbar spine (baseline) n = 50

Lumbar projection	Agreement	Expected Agreement	Kappa (k)	Standard Error	Z	Probability>Z
AP/PA	82.00%	62.48%	0.5203	0.1412	3.68	0.0001
Lat. L1-L4	84.00%	49.60%	0.6825	0.1374	4.97	0.0000
Lat. L5-S1	78.00%	58.28%	0.4727	0.1288	3.67	0.0001

ISSN: 2045-709X