Table 2 Testing for interobserver reliability by Kappa coefficient

Pair of observers (numbers of comparisons)

Interobserver reliability

Agreement interpretation

Precision

Kappa [95% CI]

All (1753)

97.3%

Substantial

0.69 [0.60–0.77]

Anaesthesiologist/Anaesthesiologist (142)

97.9%

Substantial

0.66 [0.30–1.00]

Anaesthesia recovery nurse/Anaesthesia recovery nurse (642)

97.8%

Almost perfect

0.79 [0.68–0,90]

Anaesthesiologist / Anaesthesia recovery nurse (969)

96.9%

Substantial

0.59 [0.46–0.72]