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Table 1 Summary of Results of Content Expert Review (n = 4)

From: Engaging experts and patients to refine the nutrition literacy assessment instrument

NLit Domain

Scale Content Validity Index (initial)

Scale Content Validity Index (after deletion of items with I-CVI a ≤ 0.50

Resulting Changes

Nutrition & Health

0.77

0.80

Prose text modified, 1 question deleted, 1 question modified

Energy Sources in Food

0.875

0.91

Definition in instructions modified, 1 question deleted, 2 questions modified

Household Food Measurement

0.72

0.75

1 question deleted

Food Label & Numeracy

0.98

0.98

Instructions modified, “this food” replaced with “macaroni and cheese” throughout questions

Food Groups

0.92

0.92

Food category added, 1 item deleted, 2 items modified, 2 items added

Consumer Skills

0.93

0.93

Organizational structure of answers modified, added “If [calories or portions] are equal…” to 4 items, replaced “claim” with “package states” on 3 items; Spelled out option C for all (i.e. “Applesauce with no added sugar is equal to an apply in nutrition”)

  1. a I-CVI = Item Content Validity Index