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Table 4: 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

	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