Table 6. Scaling relationships of thoracic musculoskeletal parameters and body mass.

The regression slope indicates proportional change with increasing body mass. Isometric (=), positive (+) and negative (−) allometric growth are indicated by symbols.

		n	Slope	Lower 95% CL	Upper 95% CL	R 2
Pectoralis major	M m	69	1.60 (+)	1.56	1.66	0.98
	L f	37	0.46 (+)	0.42	0.50	0.95
	PCSA	37	1.23 (+)	1.19	1.27	0.99
Pectoralis minor	M m	68	1.62 (+)	1.57	1.70	0.98
	L f	34	0.55 (+)	0.50	0.62	0.89
	PCSA	29	1.17 (+)	1.09	1.25	0.97
External oblique	M m	25	0.97 (=)	0.84	1.09	0.89
	L f	15	0.31 (=)	0.12	0.48	0.32
	PCSA	15	0.90 (=)	0.72	1.09	0.86
Sternal keel	Length	34	0.48 (+)	0.44	0.51	0.97
	Depth	34	0.55 (+)	0.51	0.59	0.95
Uncinate process	Length	31	0.30 (−)	0.28	0.32	0.94