Table 1.

Comparison of total nutrition knowledge scores between registered dietitian (RD; n 15) and non-RD (n 30) samples^* in the construct validity evaluation of a nutrition knowledge questionnaire for French Canadians

	RD sample				Non-RD sample				Difference between group means
	Mean	sd	Min.	Max.	Mean	sd	Min.	Max.	Mean difference	P value
Total nutrition knowledge score (out of 24)	21·5	2·1	18·1	24·0	15·7	3·0	5·0	20·6	5·8	0·0001

Min., minimum; max., maximum.

^*After removing items that were not loading properly, the mean score was still significantly higher for RD than for non-RD (12·2 (sd 1·2) v. 9·3 (sd 1·80 out of 13·5, respectively, P<0·0001).