Table 4. Analysis of variance of the probability of death modelled as a function of treatment and random batch effect.

Stage	Days	Chi2/DF	Random effect	Fixed effect
			variance	Num DF	Den DF	F value	Pr > F
1	5	0.82	0	2	42	0.31	0.7
	7	0.68	0	2	42	0.09	0.9
2	5	1.00	0.1404	2	41.90	0.48	0.6
	7	1.00	0.0568	2	41.67	0.40	0.7
3–4a	5	0.99	0.0340	2	42	0.03	0.9
	7	0.99	0	2	42	0.10	0.9