Longitudinal cross-sectional area measurements
| NMCSA | NCSA23 | NCSA34 | NCSA45 | |
|---|---|---|---|---|
| Mean at baseline (SD) (mm2) | 71.49 (6.37) | 67.76 (7.26) | 68.21 (7.39) | 71.51 (8.27) |
| Mean at follow-up (SD) (mm2) | 68.12 (8.91) | 65.40 (10.27) | 65.23 (10.61) | 67.95 (9.97) |
| Cord area change averaged by year (SD) (%) | −0.77 (1.14) | −0.62 (1.20) | −0.74 (1.47) | −0.77 (1.61) |
| P value | .001 | .006 | .009 | .006 |