condition mean min max ZT0-3 15.64025 15.64025 15.64025 ZT4-7 16.087699999999998 16.087699999999998 16.087699999999998 ZT8-11 14.150400000000001 14.150400000000001 14.150400000000001 ZT12-15 16.54075 16.54075 16.54075 ZT16-19 17.85 17.85 17.85 ZT20-23 14.26415 14.26415 14.26415