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. Author manuscript; available in PMC: 2008 Jul 15.
Published in final edited form as: Neuroimage. 2007 Apr 6;36(4):1065–1073. doi: 10.1016/j.neuroimage.2007.03.053

Table 2.

Numbers of longitudinal scans per subject

Longitudinal MRI
scan		 Female Male Total
Number
of scans		 Mean age at
scan (s.d).		 Number
of scans		 Mean age at
scan (s.d).		 Number
of scans		 Mean age at
scan (s.d).
1st All subjects 178 11.8 (5.1) 209 11.3 (4.4) 387 11.5 (4.7)
 Singleton 112 120 232
 Twin 66 89 155
2nd All subjects 94 12.6 (3.6) 134 13.3 (4.0) 228 13.0 (3.9)
 Singleton 57 70 127
 Twin 37 64 101
3rd All subjects 44 14.5 (3.7) 84 15.4 (3.6) 125 15.1 (3.7)
 Singleton 33 40 73
 Twin 11 41 52
4th All subjects 25 16.9 (3.7) 41 17.6 (3.4) 66 17.4 (3.5)
 Singleton 24 25 49
 Twin 1 16 17
5th All subjects 10 20.0 (4.5) 9 20.2 (4.6) 19 20.1 (4.4)
 Singleton 9 8 17
 Twin 1 1 2
6th All subjects 2 23.3 (1.0) 1 22.8 (na) 3 23.1 (0.8)
 Singleton 2 1 3
 Twin 0 0 0
7th All subjects 1 24.6 (na) 0 na 1 24.6 (na)
 Singleton 1 0 1
 Twin 0 0 0
All scans combined 354 13.0 (4.9) 475 13.3 (4.7) 829 13.2 (4.7)
 Singleton 238 264 502
 Twin 116 211 327