Group P-value Difference of
the mean 		95% CI of
the difference
Study Control Lower Upper
Volume (cm3) Mean (SD) 25.14 (5.32) 24.27 (5.2) 0.628a 0.667 -2.073 3.407
95% CI of mean 23.28; 27 22.24; 26.27
Min; max 17.09; 34.43 13.22; 34.19
Mean area (cm2) Mean (SD) 2.51 (0.53) 2.41 (0.52) 0.565a 0.079 -0.195 0.353
95% CI of mean 2.32; 2.7 2.21; 2.61
Min; max 0.71; 3.44 1.32; 2.1
MCA (cm2) Mean (SD) 1.7 (0.45) 1.55 (0.34) 0.259 0.126 -0.095 0.347
95% CI of mean 1.54; 1.88 1.42; 1.68
Min; max 0.98; 2.53 1; 2.17
Distance to MCA (cm) Mean (SD) 12.81 (3.26) 13.12 (3.51) 0.63b -0.42 -2.159 1.319
95% CI of mean 11.67; 13.95 11.75; 14.48
Min; max 10.16; 19.17 10.16; 18.74

aPositively associated with increased age; bsignificantly increased in boys.
MCA = minimum cross-sectional area; SD = standard deviation; N = number; CI = confidence interval.