| SRC (n = 123) Age mean ± SD (n) | NSRC (n = 726) Age mean ± SD (n) | P |
---|---|---|---|
Atrophy | |||
 Normal  Mild  Moderate  Marked | 56.6 ± 13.4 (14) 63.5 ± 11.5 (62) 66.9 ± 12.6 (40) 67.6 ± 12.6 (7) | 66.0 ± 12.1 (60) 67.7 ± 11.4 (253) 72.1 ± 9.4 (264) 73.3 ± 9.2 (149) | 0.012 0.011 0.001 0.253 |