Table 4.

The best-fit regression formulae for the growing lungs in the fetus.

Parameter	Right lung		Left lung
	Regression formula	R 2 value	Regression formula	R 2 value
Transverse diameter	y = −72.88 + 30.19 × ln⁡(age) ± 1.83	0.80	y = −43.05 + 19.11 × ln⁡(age) ± 1.92	0.59
Sagittal diameter	y = −120.43 + 50.80 × ln⁡(age) ± 3.63	0.75	y = −98.51 + 42.44 × ln⁡(age) ± 2.91	0.76
Height	y = −46.48 + 21.64 × ln⁡(age) ± 2.02	0.63	y = −64.41 + 28.25 × ln⁡(age) ± 2.13	0.71
Base circumference	y = −349.54 + 143.95 × ln⁡(age) ± 9.96	0.75	y = −235.49 + 101.29 × ln⁡(age) ± 8.20	0.68
Length of anterior margin	y = −106.50 + 45.85 × ln⁡(age) ± 2.97	0.78	y = −106.45 + 46.58 × ln⁡(age) ± 3.47	0.73
Length of posterior margin	y = −103.71 + 45.20 × ln⁡(age) ± 2.58	0.82	y = −96.89 + 42.98 × ln⁡(age) ± 3.38	0.70