Table 3. Mann–Kendall test statistics for time-series trends (a) in spring (March and April) temperature and bloom dates for Robinia pseudoacacia, (b) The difference in mean full bloom dates between regions. Sen’s slope: temperature change per year.

(a)
Region	Spring temperature			Bloom dates
	Sen’s slope [°C/yr]	Mann–Kendall statistic [τ]	P(<τ)	Sen’s slope [days/yr]	Mann–Kendall statistic [τ]	P(<τ)
Southwest	0.0886	20	.2464	0	-2	.9442
Southeast	0.0905	30	.0769	0.2000	6	.7305
North central	0.2033	36	.0327	-0.6508	-20	.1379
Seoul	0.2123	26	.1272	-0.3028	1-9	.5824
(b)
Region-Region	Sen’s slope [days/yr]			Mann–Kendall statistic [τ]	P(<τ)
Southwest-Southeast	-0.1056			-14	0.3704
Southwest-North central	-0.7098			-27	0.0417
Southwest-Seoul	-0.0336			-3	0.8907
Southeast-North central	-1.0119			-26	0.0509
Southeast-Seoul	-0.4670			-17	0.2714
North central-Seoul	-0.2251			-19	0.1585