Table 2

Kappa coefficient of exposure variables according to coder pairs

			Kappa
	Episodes  n	Subjects  n	Episode exposure status	Episode exposure probability	Subject exposure status	Subject exposure probability
General	2099	425	0.69	0.66	0.64	0.60
Same coder	755	146	0.78	0.77	0.70	0.66
Coder 1 for both coding series	227	49	0.80	0.75	0.86	0.66
Coder 2 for both coding series	277	49	0.79	0.77	0.53	0.60
Coder 3 for both coding series	251	48	0.75	0.77	0.66	0.72
Different coders	1344	279	0.64	0.60	0.62	0.57
Pair 1–2	464	91	0.61	0.57	0.60	0.49
Pair 1–3	446	92	0.61	0.60	0.58	0.60
Pair 2–3	434	96	0.69	0.62	0.65	0.62