Table 1. The proportion of species moving northwards in each of the four partitions for plants with increasing occupancy.

The overall average is calculated as if the four separate partitions were replicates of the same experiment (n = 4).

Partition	Number of species moving north	Total number of species	Proportion moving northward and 95% confidence interval
Scotland	163	251	0.65 (0.59–0.71)
Northern England	189	331	0.57 (0.52–0.62)
Wales	133	238	0.55 (0.50–0.62)
Southern England	216	423	0.51 (0.46–0.56)
All			0.56 (0.51–0.62)