Table 1. The R2* values (1/sec) in the six deep gray nuclei in eight periods (Mean ± SD, n = 56).

group	M/n	CN	PUT	GP	THA	RN	SN
37≤PMA<41	2/6	6.29±0.58	7.46±0.80	7.81±0.63	7.64±0.80	8.53±2.63	9.16±1.67
41≤PMA<46	7/13	6.95±1.24	8.26±1.07	7.55±1.44	7.87±1.00	10.10±1.51	10.07±1.35
46≤PMA<51	8/11	7.19±0.74	8.83±0.87	8.43±0.98	8.96±0.77	10.50±1.50	9.50±1.16
51≤PMA<56	4/6	8.08±1.06	8.38±1.11	8.31±1.02	9.08±1.28	10.31±1.21	9.60±0.79
56≤PMA<61	4/5	8.55±1.71	8.89±1.31	8.83±1.40	9.78±0.88	10.60±1.30	10.54±1.63
61≤PMA<66	5/6	7.45±1.27	9.38±1.46	9.08±1.45	9.88±0.95	11.23±2.21	10.23±1.18
66≤PMA<76	2/3	9.38±0.43	10.44±0.32	10.03±0.53	10.14±0.68	10.84±0.60	11.46±1.34
76≤PMA<91	4/6	10.58±0.60	10.81±0.19	10.98±0.84	11.00±0.33	11.06±0.88	11.43±0.86

Note: Infants were divided into eight groups according to the postmenstrual age (PMA).

M: male; CN: caudate nucleus; PUT: putamen; GP: globus pallidus, THA: thalamus; RN: red nucleus; SN: substantia nigra.