Table 3.

Linkage between marker and papilloma onset (Cox multivariate regression method)

Marker	No. of subjects	Survival time, weeks			χ2‡	P value	Corrected P value
		75%†	50%†	25%†
Total	189	10	12	16
D7Mit246 (15.0 cM)
N-N	109	9	11	15
N-S	57	12	15	16	9.21	0.0024	0.071

^†75%, 50%, and 25% indicate the percentage of mice alive until the time (in weeks) after initiation. 

^‡χ² values were obtained by the Cox regression method.