Chloroplast gene expression level is negatively correlated with evolutionary rates and selective pressure while positively with codon usage bias in Ophioglossum vulgatum L

Table 3 Descriptive statistics of CAI, Fop, ENC, and tAI

Variable	Mean	Maximum	Minimum	Variance	Standard deviation	Coefficient of Variation
CAI	0.18	0.35	0.12	0.0016	0.0395	21.9731
Fop	0.38	0.60	0.29	0.0026	0.0511	13.5103
ENC	52.16	58.05	41.98	8.3906	2.8967	5.5539
tAI	0.38	0.48	0.30	0.0015	0.0387	10.1615

ISSN: 1471-2229