Table 4 Linear mixed-effects model results for central sulcus metrics by postmenstrual age.

From: 3D ultrasound assessment of the central sulcus in very preterm infants: feasibility and reproducibility of opening metrics study

VOLUME

β(PMA) units/week (95% CI)

P-value

σ² between subject

σ² within

subject

σ²between/σ²within

0.037 (0.025–0.048)

0.0001

0.010

0.019

0.537

TORTUOSITY

0.0104 (0.007–0.014)

0.0001

0.005

0.002

2.5

SURFACE

0.448 (0.308–0.588)

0.0001

1.245

2.911

0.327

LENGTH

0.956 (0.251–1.662)

0.008

17.663

78.226

0.225

MEAN DEPTH

0.493 (0.349–0.640)

0.0001

0.775

3.231

0.239

MEAN LINEAL DEPTH

0.329 (0.235–0.424)

0.0001

0.289

1.412

0.205

MAX DEPTH

0.914 (0.575–1.253)

0.0001

2.815

18.776

0.150

MAX LINEAL DEPTH

0.545 (0.397–0.693)

0.0001

0.922

3.381

0.272

MEAN OPENING

0.055 (− 0.045–0.155)

0.281

0.441

1.541

0.286

MAX OPENING

0.272 (0.100-0.443)

0.002

1.388

4.495

0.309

MEAN FOLD OPENING

0.054 (-0.005-0.114)

0.076

0.189

0.539

0.351

MAX FOLD OPENING

0.330 (0.160–0.501)

0.0001

1.263

4.496

0.281

  1. N observations: 93 N patients: 13 P = 0.0001.
  2. β: β coefficients in units per week (Volume (mm3), tortuosity (dimensionless ratio), surface (mm2), length (mm), depth (mm) and opening (mm).); PMA: postmenstrual age; σ²: variance.
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