Table 4. Summary of correlation between the first two principle axes and nucleotide constraints in CHIKV genomes.

Composition (%)	f′1 (53.57%)	f′2 (25.16%)
A3	−0.50**	−0.97NS
U3	0.310**	−0.659**
C3	−0.35**	0.69**
G3	0.58**	−0.134NS
GC3	−0.24**	0.740**
GC	−0.21*	0.640**
A	−0.54**	0.174*
U	0.25**	−0.340**
G	−0.29**	0.390**
C	0.517**	−0.126NS

The numbers in the each column represents correlation coefficient “r” values, which are calculated in each correlation analysis.

NS: non-significant (P>0.05).

*represents 0.01<P<0.05.

**represents P<0.01.