Table 2.

Linkage between marker and survival time (Cox multivariate regression method)

Marker	No. of subjects	Survival time, weeks			χ2‡	P value	Corrected P value
		75%†	50%†	25%†
Total	83	31	38	45
D6Mit15-D7Mit12-D17Mit7
N-N : N-N : N-N	11	34	39	44
N-N : N-N : N-S	13	29	39	46
N-N : N-S : N-N	9	44	56	68
N-N : N-S : N-S	6	27	32	45	25.22	5.1 × 10−8	3.7 × 10−5
N-S : N-N : N-N	10	29	32	45
N-S : N-N : N-S	14	24	31	32
N-S : N-S : N-N	5	40	42	44
N-S : N-S : N-S	15	36	39	47
D6Mit15 (74.0 cM)
N-N	39	32	41	55
N-S	44	30	33	40	8.70	0.0032	0.094
D7Mit12 (66.0 cM)
N-N	48	29	32	41
N-S	35	37	42	56	8.49	0.0036	0.11
D17Mit7 (27.3 cM)
N-N	35	34	41	55
N-S	48	29	33	44	3.56	0.0593	0.89

N-N, homozygous NIH/Ola Mus spretus; N-S, heterozygous NIH/Ola Mus spretus. 

^†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.