Table 2.

Pullout strength of all groups: mean results with range and standard deviation; Student’s paired t-test between all groups

Specimen number	Vertebrae	Pullout strength of group 1 (N)	Pullout strength of group 2 (N)	Pullout strength of group 3 (N)
1	T9, T11, T12	250	225	120
2	T11, T12, T9	125	250	620
3	T8, T9, T10	430	430	625
4	T12, T10, T11	30	600	250
5	T10, T12, T8	250	250	205
6	L1, L3, L4	100	105	50
7	L2, L4, L5	150	200	430
8	L3, L5, L1	10	65	35
9	L4, L1, L2	325	875	240
10	L5, L2, L3	250	635	130
Mean (range)		192 (10–430)	364 (65–875)	271 (35–625)
SD		133	263	217

Student’s paired t-test: pullout strength

Group 1 versus group 2: p=0.0475, significant

Group 1 versus group 3: p=0.2646, nonsignificant

Group 2 versus group 3: p=0.3863, nonsignificant