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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Neuroimage. 2013 May 20;81:10.1016/j.neuroimage.2013.05.049. doi: 10.1016/j.neuroimage.2013.05.049

Table 1.

Number and timing of scans per time point by clinical group

Time point HC Stable MCI Converter MCI AD Time from baseline
Baseline 210 227 166 188 0
Year 0.5 (month 6) 197 194 161 166 0.58 ± 0.07 [0.21-0.94]
Year 1 183 177 153 150 1.08 ± 0.07 [0.68-1.38]
Year 1.5 0 153 136 0 1.59 ± 0.08 [1.26-1.92]
Year 2 129 108 106 96 2.09 ± 0.10 [1.58-2.88]
Year 3 115 68 70 0 3.09 ± 0.09 [2.52-3.45]
Year 4 11 3 10 0 4.12 ± 0.09 [3.98-4.38]
Total 845 930 802 600

Time from baseline (in years) is in mean ± standard deviation; Ranges are listed in square brackets.