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Difficulty labels are estimates from item features (stem length, vignette signals, option count), not calibrated psychometric values — they adapt as you answer in Study mode. Counts on this page are computed live from the question bank files; held or flagged items are excluded. This is an unofficial study resource, not affiliated with the NCSBN, Pearson VUE, AACN, CCNE, or any nursing program. Full disclaimer.