Table 3. Duncan test grouping for environmental variables affecting DBH growth.

Survey order	Mean DBH	Significant grouping	Climate zone	Mean DBH	Significant grouping	Altitude (m)	Mean DBH	Significant grouping
5th	13.86	A	NT	20.03	A	>100 m	19.41	A
6th	20.52	B	CT	19.60	A	101-200 m	19.40	A
7th	23.08	C	WT	18.86	A	201-300 m	18.67	A
-	-	-	ST	16.90	B	301-400 m	15.46	B

(note) NT: northern temperate zone, CT: central temperate zone, ST: southern temperate zone, WT: warm temperate zone.