Table 2.

Numerical data of the growing right lung.

Age [weeks]	n	Right lung (all parameters are expressed in millimeters [mm])
		Transverse diameter		Sagittal diameter		Height		Base circumference		Anterior margin  length		Posterior margin  length
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
16	2	11.35	0.62	21.56	0.02	15.28	0.86	50.48	1.08	21.59	2.88	23.79	2.35
17	8	13.14	1.56	22.94	2.53	15.12	1.15	54.77	14.84	23.89	2.75	23.94	1.92
18	10	13.43	2.01	25.57	4.05	16.43	2.31	66.02	9.64	24.64	4.36	26.42	2.67
16–18	20	13.10(a)	1.79	24.12(a)	3.54	15.79(a)	1.87	59.97(a)	12.86	24.03(a)	3.61	25.17(a)	2.59
19	6	17.21	1.17	30.46	4.06	18.62	2.90	84.09	9.71	30.83	1.35	31.32	4.01
20	14	16.90	2.46	29.51	3.98	17.95	2.62	75.50	8.84	29.01	3.05	30.91	3.55
21	7	19.96	2.23	33.89	7.64	19.72	1.86	94.02	12.55	33.33	3.03	34.99	2.83
19–21	27	17.76(b)	2.49	31.50(b)	4.76	19.18(b)	2.78	82.21(b)	10.49	30.53(b)	2.24	32.06(b)	3.79
22	5	18.51	2.99	37.16	5.43	21.70	1.40	92.08	19.42	35.58	4.27	35.36	2.04
23	6	20.37	1.79	38.35	4.81	22.00	2.07	98.93	9.78	37.42	3.14	37.50	2.65
24	6	23.23	2.12	41.23	5.56	22.82	3.11	110.66	9.95	39.14	1.28	40.76	2.26
25	3	23.36	4.80	41.94	3.03	25.22	3.57	113.80	11.68	42.13	3.94	40.55	2.97
22–25	20	21.21(c)	3.24	39.45(c)	5.02	22.66(c)	2.62	102.97(c)	14.78	38.19(c)	3.63	38.40(c)	2.69

Note: between the three age groups of 16–18, 19–21, and 22–25 weeks, the means for all the pulmonary parameters studied marked by letters (a), (b), and (c) in every column differ significantly: (a) versus (b) p < 0.001, (a) versus (c) p < 0.001, and (b) versus (c) p < 0.001.