Table 2.

Validity at time 0 of categorised items by academic background

Constructs	NK score for nutrition background group			NK score for non-nutrition background group			P-value*
	Mean	sd	Range (min–max)	Mean	sd	Range (min–max)
1: experts’ recommendation	4·2	1·1	2–6	3·7	1·2	1–6	0·009
2: nutrients contents of food	38·3	4·0	26–47	29·6	5·6	15–44	<0·001
3: health aspects of food and diet	6·9	1·5	3–9	6·3	1·6	2–9	0·018
4: relationship between diet and diseases	13·1	2·7	5–17	11·1	3·4	2–17	<0·001
5: proper food choice	3·5	1·3	0–6	2·7	1·3	0–5	0·001
Total	66·1	7·5	43–81	53·4	9·8	33–75	<0·001

NK, nutrition knowledge.

^*Two-sample t test with P < 0·05.