. 2011 Feb 2;7(1):85–91. doi: 10.1007/s13181-010-0130-6

Table 4.

Kappa coefficient describing agreement between report of acute symptoms experienced in rapid assessment and follow-up assessment, stratified by those who reported that they experienced ringing of the ears after chlorine exposure and those who reported that they did not

Symptom	Kappa^a
Symptom	All	Reported ear ringing^b	Reported no ear ringing
Chest pain	0.56	0.44	0.65
Short of breath	0.49	0.17	0.60
Eye burning	0.44	0.29	0.48
Phlegm	0.32	0.03	0.44
Choking	0.32	0.31	0.38
Dizziness	0.31	0.23	0.19
Headache	0.30	0.16	0.38
Nausea	0.25	0.01	0.35
Coughing	0.13	-0.07	0.25
Vomiting	0.11	-0.06	0.20
Nose burning	0.06	0.03	0.08
Total^c	0.30	0.14	0.36

^aKappa coefficient values of 0.4–0.75 indicate moderate agreement and values <0.4 indicate poor agreement

^bRinging of the ears has not been identified in the literature as a symptom of chlorine exposure and was not reported by any of the participants during the rapid assessment. It was included in the follow-up assessment to try to determine if respondents would answer yes to any symptom listed on the questionnaire

^cWeighted average