Table 3.

Vertical paddle motion for large paddles (24 × 29 cm and 24 × 30 cm) during the first, second, third and fourth 10 s time periods after clamping commencement

Time period (s)	0–10	10–20	20–30	30–40	0–40
Paddle type	Average paddle motion (x̅ ± SD, n) (mm/10 s)
Hologic Lorad Selenia (flexible)	0.17 ± 0.05, 20	0.06 ± 0.02, 20	0.03 ± 0.01, 20	0.01 ± 0.01, 20	0.27 ± 0.07, 80
GE Senographe Essential (flexible)	0.30 ± 0.09, 80	0.06 ± 0.02, 80	0.05 ± 0.02, 80	0.04 ± 0.01, 80	0.45 ± 0.10, 320
GE Senographe Essential (fixed)	0.31 ± 0.09, 100	0.08 ± 0.02, 100	0.04 ± 0.01, 100	0.03 ± 0.01, 100	0.46 ± 0.10, 400
Siemens Mammomat Inspiration (flexible)	0.33 ± 0.10, 20	0.12 ± 0.04, 20	0.09 ± 0.03, 20	0.04 ± 0.01, 20	0.58 ± 0.15, 80
Hologic Selenia Dimensions (flexible)	0.35 ± 0.11, 80	0.15 ± 0.04, 80	0.10 ± 0.03, 80	0.05 ± 0.02, 80	0.65 ± 0.17, 320
Hologic Selenia Dimensions (fixed)	0.42 ± 0.13, 80	0.13 ± 0.04, 80	0.07 ± 0.02, 80	0.06 ± 0.02, 80	0.68 ± 0.16, 320

x̅ is the mean; SD, standard deviation; n, number of observations.

Flexible paddles are in italicized text.

Hologic Lorad Selenia, Hologic Selenia is obtained from Hologic, Bedford, MA; GE Senographe Essential is obtained from General Electric Medical Systems, Milwaukee, WI; and Siemens Mammomat Inspiration is obtained from Siemens, Erlangen, Germany.