Table 1. χ² analyses of gene changes after LPS treatment.

	Up-regulated genes and time*		FC at 24 h in RV and LV*		FC at 6 h in RV and LV†		Large FC at 24 h in RV and LV*		Large FC at 6 h in RV and LV‡
	With treatment effect	Entire data set	Treatment FC < ± 2	Treatment FC ≥ ± 2	Treatment FC < ± 2	Treatment FC ≥ ± 2	Treatment FC < ± 5	Treatment FC ≥ ± 5	Treatment FC < ± 5	Treatment FC ≥ ± 5
6 h	139	3,903
24 h	423	3,758
Right			375	174	183	76	505	44	246	13
Left			476	73	203	56	531	18	253	6

In this table, we report five separate χ² analyses (first through fifth columns). These show associations between transcription changes and time or side of heart ventricle. The analyses revealed that significantly more genes are upregulated at 24 h than at 6 h after LPS treatment (first column). Significantly more genes had fold-change ≥ 2 in the RV at 24 h (second column) and at 6 h (third column). The proportion of genes with treatment fold changes ≥ 5 was significantly higher in the RV when compared to the LV at 24 h (fourth column), but not at 6 h (fifth column). FC, fold change.

^*P < 0.0001

^†P = 0.045

^‡P = 0.101