S100A4 and incontinentia pigmenti: In the multivariable analysis, high S100A4 level (OR 42.28; 95%CI 3.98–449.29; P = 0.002), male (P = 0.033), low %VC (≤ 80%) (OR 10.20; 95%CI 1.26–82.26; P = 0.029), and operative time (OR 1.03; 95%CI 1.01–1.04; P = 0.001) were significant predictive factor of AE of IP (Table 3).