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. 2015 Jan 20;44(4):20140316. doi: 10.1259/dmfr.20140316

Table 9.

Mean case difficulty scores before and after availability of CBCT

  Mean difficulty scores
Before availability of CBCT
After availability of CBCT
Difference between means SD of difference between means
Mean SD Mean SD
Regular cases 7.00 1.83 7.00 1.51 0.00 1.41
Challenging cases 7.69 1.74 8.63 1.45 0.94 0.30
All cases 7.34 1.79 7.81 1.67 0.47 1.37

SD, standard deviation.