condition mean min max ZT0-3 61.56189 61.56189 61.56189 ZT4-7 66.4869475 66.4869475 66.4869475 ZT8-11 31.702018000000002 31.702018000000002 31.702018000000002 ZT12-15 20.251389 20.251389 20.251389 ZT16-19 14.593021 14.593021 14.593021 ZT20-23 15.092792500000002 15.092792500000002 15.092792500000002