Table 5. Cochran’s C tests for heterogeneity of within-line variances for life span.

Sex	Environment	Average n	k (lines)	C (test statistic)	P value
Female	18°C	64	183	0.0146	2.17 × 10−9
	25°C	65	186	0.0178	7.77 × 10−16
	28°C	66	177	0.0227	< 2.2 × 10−16
Male	18°C	62	183	0.0162	1.34 × 10−11
	25°C	64	186	0.0143	2.46 × 10−9
	28°C	65	177	0.0211	< 2.2 × 10−16