TABLE 5

Interobserver and Intraobserver Variability for V/Q Scintigraphy with Technegas

Variability	Consensus		Observer 2		Observer 1
Variability	Mismatch	Match	Mismatch	Match	Mismatch	Match
Local
Mismatch	37	5	35	6	35	5
Match	2	41	2	35	5	31
Observer 1
Mismatch	38	6	38	5	22
Match	2	36	2	35	2	22
Observer 2
Mismatch	36	5	22	1
Match	4	39		25

Technegas V/Q scintigraphy	n	κ (95% CIs)	McNemar
Local vs. consensus	85	0.84 (0.72–0.95)	0.45
Observer 1 vs. consensus	82	0.81 (0.68–0.93)	0.29
Observer 2 vs. consensus	84	0.79 (0.65–0.92)	1.0
Observer 1 vs. local	76	0.74 (0.58–0.89)	1.0
Observer 2 vs. local	78	0.80 (0.66–0.93)	0.29
Observer 1 vs. observer 2	80	0.83 (0.70–0.95)	0.45
Observer 1 vs. observer 1	46	0.91 (0.80–1.0)	0.50
Observer 2 vs. observer 2	48	0.96 (0.88–1.0)	1.0

Number of patients varies because of variation in indication for ventilation. Interobserver agreement is given in lightface type. Numbers in boldface type indicate intraobserver agreement.