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. 2014 Nov 14;87(1044):20140241. doi: 10.1259/bjr.20140241

Table 6.

Summary of change in compression force for the clinical audit at time interval (t1t2)

Change in compression force Paddle size, paddle type
18 × 24 cm, flexible 24 × 29 cm, flexible
Maximum (N) 9 15
Minimum (N) 1 1
Average (N) 4 4.7
Standard deviation (N) 2.70 3.6

t1, point at which compression force ceases to be applied; t2, point at which the exposure terminates.