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Table 1 Numbers of correctly, unidentified and incorrectly identified needles in 10 acupuncturists on 40 (23 non-penetrating/17 penetrating) needles

From: A double-blind placebo needle for acupuncture research

Acupuncturist Years of experience Number of correctly identified needles (non-penetrating/penetrating) Number of unidentified needles (non-penetrating/penetrating) Number of incorrectly identified needles (non-penetrating/penetrating)
No. 1 8 15 (10/5) 6 (2/4) 19 (11/8)
No. 2 25 21 (12/9) 7 (3/4) 12 (8/4)
No. 3 15 19 (13/6) 9 (3/6) 12 (7/5)
No. 4 13 22 (12/10) 1 (0/1) 17 (11/6)
No. 5 3 14 (12/2) 8 (4/4) 18 (7/11)
No. 6 5 13 (10/3) 12 (7/5) 15 (6/9)
No. 7 5 9 (7/2) 10 (3/7) 21 (13/8)
No. 8 25 19 (8/11) 3 (2/1) 18 (13/5)
No. 9 10 19 (9/10) 6 (4/2) 15 (10/5)
No. 10 15 19 (14/5) 2 (1/1) 19 (8/11)
Mean ± SD 12.4 ± 7.8 17 ± 4.1 (10.7/6.3) 6.4 ± 3.6 (2.9/3.5) 16.6 ± 3.0 (9.4/7.2)