. 2012 Oct 31;32(44):15547–15564. doi: 10.1523/JNEUROSCI.0412-12.2012

Table 1.

Statistical analysis of medulloblastoma incidence and latency^a

Genotype	Tis21^WT	Tis21^KO	Ptch1^+/−/Tis21^WT	Ptch1^+/−/Tis21^+/−	Ptch1^+/−/Tis21^KO
Medulloblastoma (%)	0 (0.0)	0 (0.0)	118 (25.35)	41^* (75.93)	60^* (80.00)
Average latency (weeks)	—	—	20.09 ± 1.7	25.46 ± 1.5^†	25.57 ± 1.3^†
No. of mice analyzed	40	42	71	54	75

^aThe five genotypes refer to the progeny of breedings between Patched1 heterozygotes and Tis21 knock-out mice; all mouse genotypes are in the same genetic background, having been cross-mated for at least six generations.

*p < 0.0001 versus Ptch1^+/−/Tis21^WTgroup (χ² test).

^†p < 0.05 versus Ptch1^+/−/Tis21^WT group (Student's t test).