Table 2.

Length and transverse diameters for proximal end, middle part and distal end of the right ulna’s shaft primary ossification center in human fetuses

Gestational age (weeks)	N	Length (mm)		Transverse diameter (mm)
				Proximal end		Middle part		Distal end
		Mean	SD	Mean	SD	Mean	SD	Mean	SD
17	3	18.88	0.12	1.62	0.06	1.28	0.07	1.14	0.02
18	3	19.07	0.04	1.87	0.13	1.40	0.03	1.18	0.01
19	5	19.77	0.44	2.23	0.06	1.44	0.03	1.32	0.07
20	3	22.58	0.04	2.46	0.09	1.53	0.05	1.50	0.05
21	4	24.07	1.03	2.67	0.20	1.64	0.09	1.62	0.09
22	2	27.17	0.02	3.08	0.05	1.77	0.04	1.94	0.16
23	3	27.70	0.55	3.43	0.09	1.86	0.03	2.18	0.03
24	6	28.91	0.28	3.77	0.13	1.99	0.08	2.34	0.04
25	3	30.06	0.69	4.04	0.11	2.13	0.04	2.58	0.09
26	3	31.85	0.10	4.15	0.02	2.20	0.03	2.73	0.04
27	5	32.90	0.60	4.37	0.06	2.31	0.04	2.90	0.08
28	2	34.17	0.36	4.52	0.06	2.40	0.01	3.11	0.02
29	2	34.81	0.21	4.83	0.08	2.47	0.02	3.24	0.07
30	4	37.68	0.96	5.11	0.17	2.61	0.10	3.69	0.09