borderline significanceP = 0.05
Group‐to‐group comparisons showed that there was no statistical difference between Groups 1 and 2 (log‐rank Mantel–Cox 1.0; P = 0.3), a borderline significance between Groups 2 and 3 (log‐rank Mantel–Cox 5.4; P = 0.05), and a significant difference between Groups 3 and 4 (log‐rank Mantel–Cox 14.8; P = 0.008).