condition mean min max ZT0-3 16.4595025 9.729805 23.1892 ZT4-7 22.49995 22.49995 22.49995 ZT8-11 13.785 13.785 13.785 ZT12-15 0 0 0 ZT16-19 34.76935 34.76935 34.76935 ZT20-23 31.2954 31.2954 31.2954