Table 2.

Dunn’s test results for four geographic regions of the conterminous USA.

Comparison	Region
	South		North		Interior West		West Coast
	z	p	z	p	z	p	z	p
Defoliation—mortality	57.82	< 0.0001	327.73	< 0.0001	− 59.41	< 0.0001	− 95.86	< 0.0001
Defoliation—no damage	603.28	< 0.0001	662.82	< 0.0001	904.55	< 0.0001	242.08	< 0.0001
Mortality—no damage	236.15	< 0.0001	89.06	< 0.0001	1278.74	< 0.0001	716.86	< 0.0001

Multiple pairwise comparisons of the distributions of total basal area (TBA) values between three groups: Defoliation = all forested (i.e. TBA > 0) map cells where defoliation was recorded at least once from Insect and Disease Survey (IDS) data in the analysis period, 2000–2019; Mortality = all forested cells where mortality was recorded at least once in the period; No damage = all forested cells where neither defoliation nor mortality was recorded during the period. Table 1 shows the number of observations (map cells) n in each group. Individual z test statistics shown for each pairwise comparison; p-values corrected using the Benjamini–Hochberg adjustment.