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Table 3 Patient evaluation on usability (n; %)

From: Sublingual sufentanil tablet system Zalviso® for postoperative analgesia after knee replacement in fast track surgery: a pilot observational study

Score Patient’s Understanding Correct use by patient Administration Mobility
Very Difficult 0 (0) 0 (0) 0 (0) 0 (0)
Difficult 2 (2.1) 0 (0) 2 (2.1) 0 (0)
Normal 7 (7.4) 4 (4.2) 2 (2.1) 1 (1.1)
Easy 76 (80) 76 (80) 75 (78.9) 75 (78.9)
Very easy 8 (8.4) 11 (11.6) 12 (12.6) 14 (14.7)
unknown 2 (2.1) 4 (4.2) 4 (4.2) 5 (5.3)