Reliability of Questionnaires to Assess the Healthy Eating and Activity Environment of a Child's Home and School

Table 4

Reliability demonstrated by intraclass correlation coefficient (ICC) and 95% confidence intervals (CI) for the teacher outcomes and internal consistency for the teacher scores.

Score	Reliability data			Median (interquartile range)		𝑁	Target score/response
	ICC	95% CI	Cronbach’s alpha	Time 1	Time 2
Child exposure
Healthy eating	0.86**	0.67–0.94	0.61	9 (6–10)	9 (7–12)	20	≥15 (weekly, some, agree as relevant)
Fruit and vegetables	0.77**	0.52–0.90	0.91	7.5 (5–11)	7 (5–13)	22	≥16 (weekly each item)
Physical activity	0.67**	0.38–0.84	0.58	21.5 (19–26)	22 (19–25)	23	≥30 (weekly, some, agree as relevant)
Water	0.82**	0.63–0.91	N/A	5 (4-5)	5 (5-5)	26	Used daily
Teacher skills/attitudes
Healthy eating	0.71**	0.40–0.88	0.60 (𝑛=24)	4 (4–6)	5 (5-5)	24	≥7 (some, yes as relevant)
Fruit and vegetable	0.61**	0.30–0.80	0.11	23 (21–24)	22 (22-23)	26	≥24 (agree each item)
Physical activity	0.56*	0.11–0.82	0.22 (𝑛=23)	25 (24–27)	24 (23–26)	16	≥27 (some, yes, agree as relevant)
School environment
	0.67**	0.39–0.84	N/A	3 (2-3)	3 (2-3)	26	Agree
Teacher knowledge
Fruit	0.42*	0.05–0.67	N/A	2 (2-3)	2 (2-3)	27	1-2 serves
Vegetable	0.63**	0.33–0.81	N/A	3 (2-3)	3 (3-3)	27	3–5 serves
Screen time	0.53*	0.20–0.76	N/A	2 (1-2)	2 (2-2)	27	2 hours
Physical activity	0.81**	0.63–0.91	N/A	3 (2-3)	2 (2-2)	27	60 minutes

^∗𝑃<0.05.
^∗∗𝑃<0.001.
N/A: not applicable.