Table 1.

Significance levels from statistical analyses of a study involving pine species treated with ozone.

Analysis of Variance
Days of fumigation	Among Species	Among O₃ concentrations within species
7	^{* *}	^*
24	^{* *}	^{* *}
31	^{* *}	^{* *}
38	^{* *}	^{* *}
52	^{* *}	^{* *}
70	^{* *}	^{* *}
Chi-Square Test of Survival
	Comparison with control (0 pphm O₃ seedlings in survival)
Species	20 pphm O₃	30pphm O₃
P. sylvestris	^*	^*
P. parviflora	NS	NS
P. banksiana	NS	^*
P. ponderosa	NS	NS
P. thunbergii	NS	NS
P. nigra	NS	NS
P. strobiformis	NS	NS
P. strobus	NS	NS
P. aristata	NS	NS

↵*, * * Significant at 0.05 and 0.01 probability levels, respectively.
NS = Not significant at the 0.05 level