Table 1.

Internal reliability analyses of knowledge and attitude scale.

Measure	Description	Items	Reliability	Range	Cutoff	Mean (SD)	Outcome
Knowledge scale	Knowledge of ECS	14 questions (True/False/I don’t know)	0.729a	0–14	0–4 = Low knowledge; 5–9 = Moderate knowledge; 10–14 = High knowledge	10.61 (2.61)	Low knowledge = 2.2%; Moderate knowledge = 26.3%; High knowledge = 71.5%
Attitude scale	Attitudes towards having ECS	Five bipolar words pairs (5-point Likert scale)	0.889b	5–25	5–11 = Negative attitude; 12–18 = Neutral attitude;19–25 = Positive attitude	18.15 (4.82)	Negative attitude = 10.6%; Neutral attitude = 40.4%; Positive attitude = 49%

^aRemoving knowledge item 5 would result in a slightly higher Cronbach’s Alpha (13 items, α = 0.739).

^bRemoving attitude item 4 would have resulted in a slightly higher Cronbach’s Alpha (4 items, α = 0.892). We decided against removal of these items because of the minimal differences in scores.