condition mean min max ZT0-3 183.462826 183.462826 183.462826 ZT4-7 130.601098 130.601098 130.601098 ZT8-11 176.32690250000002 176.32690250000002 176.32690250000002 ZT12-15 166.617372 166.617372 166.617372 ZT16-19 250.1632745 250.1632745 250.1632745 ZT20-23 270.9816435 270.9816435 270.9816435