Table 2.

Opposite versus same orientation in common ivy (H. helix) leaf pairs. For each PC representing asymmetric shape variance in ivy leaves (figure 5b), the number of leaf pairs with opposite versus same PC sign, the number of leaf pairs, the ratio of the number of opposite-to-same pairs and the p-value for the one-sided exact test that the odds ratio of opposite-to-same pairs exceeds unity are provided.

PC	variance (%)	opposite	same	n	ratio	p-value
PC1	61.1	430	394	824	1.09	0.2011
PC2	11.4	462	362	824	1.28	0.0078
PC3	9.8	451	373	824	1.21	0.0304
PC4	5.2	437	387	824	1.13	0.1184