Table 1. T 2 in young and elderly cohorts and summary statistics.
| Compound | Young T 2 (ms) | Elderly T 2 (ms) | One-sided probability p | Two-sided probability p | Elderly T 2 ∕ Young T 2 | |
|---|---|---|---|---|---|---|
| NAA | 208 ± 18 (252 – 176) | 161 ± 19 (200 – 138) | 0.00000014 | 0.00000028 | 0.77 | |
| tCr | 157 ± 14 (190 – 138) | 132 ± 11 (154 – 120) | 0.0000044 | 0.0000087 | 0.84 | |
| tCho | 164 ± 29 (248 – 131) | 147 ± 16 (178 – 122) | 0.0297 | 0.059 | 0.90 | |
| Tissue water | 52 ± 2 (48 - 57) | 47 ± 4 (40 - 51) | 0.0000019 | 0.0000039 | 0.90 | |
T 2 values (mean ± SD, minimum and maximum values in parenthesis) NAA at 2.01 ppm, tCr at 3.03 ppm, tCho at 3.20 ppm, and tissue water measured in the occipital lobe in 18 young and 14 elderly subjects.