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Table 1 Showing patients perception of how their teeth looked and felt after they had received a scale and polish.

From: A randomised controlled trial to explore attitudes to routine scale and polish and compare manual versus ultrasonic scaling in the general dental service in Scotland [ISRCTN99609795]

  Manual % (n = 166) Ultrasonic % (n = 185) P Crossover (%) (n = 69)
Feel cleaner 88 89 0.001 0.971 87
Feel smother 72 65 1.62 0.203 73
Feel the same 2 3 * 0.727 3
Feel worse 0 2 * 0.250 3
Look better 49 55 0.75 0.386 61
Look the same 4 7 0.493 0.483 4
Look worse 0.006 0.005 * > 0.999 0
  1. *: Fisher's Exact Test