Development and validation of a brief general and sports nutrition knowledge questionnaire and assessment of athletes’ nutrition knowledge

Table 2 Summary of properties of the A-NSKQ

Section (number of questions)	Overall-item interaction statistics† (Mean ± SD)	Overall-person interaction statistics † Mean (SD)	Chi-Square probability ‡ (P-value)	Perc5% ¶	Person Separation Index ¥	Test-retest reliability ¥ (Pearson’s r)	Score (%)
Total (n = 37)	0.04 ± 0.90	0.01 ± 0.74	0.076	7.39	0.8	0.7*	Nutrition: 66 +/−14 § Non-nutrition: 52+/−13*
General (n = 17)	−0.15 ± 0.96	−0.11 ± 0.61	0.308	2.84	0.6	0.8*	Nutrition: 77 (24) ǁ Non-nutrition: 65 (25) *
Sports (n = 20)	0.22 ± 1.11	−0.08 ± 0.73	0.283	3.41	0.7	0.7*	ǁ Nutrition: 60 (25) Non-nutrition: 40 (21)*

† Mean ± SD = 0 ± 1 = perfect fit; SD > 1.5 = misfit. ‡Non-significant p-value = fit. ¶ < 5% = unidimensionality. ¥ PerSepIndex> 0.7 = adequate internal reliability. ¥ r ≥ 0.7 = test-retest reliability. § Score reported as mean +/− SD. ǁ score reported as median (IQR) * P = < 0.001

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