TABLE 2.

Allometric relationships between virion volume and genome length

Group	Allometric exponent (95% CI)	Scaling factor (95% CI)
All viruses	1.43 (1.26–1.6)	2,057 (1,185–3,571)
Enveloped	1.37 (1.14–1.6)	7,515 (2,969–19,024)
Nonenveloped	1.06 (0.88–1.23)	3,170 (1,977–5,082)
Linear	1.46 (1.27–1.66)	1,775 (917–3,435)
Circular	1.74 (1.12–2.36)	1,848 (675–5,057)
Spherical	1.17 (0.98–1.36)	2,785 (1,621–4,785)
Nonspherical	1.44 (1.19–1.69)	5,697 (2,088–15,545)
dsDNA	1.52 (1.16–1.87)	1,182 (246–5,675)
dsRNA	0.97 (−0.11–2.05)	6,760 (602–75,960)
Positive-sense ssRNA	1.95 (1.33–2.58)	596 (159–2,238)
Negative-sense ssRNA	2.58 (1.23–3.94)	1,314 (46–37,463)