condition mean min max ZT0-3 26.015325 22.47365 29.557000000000002 ZT4-7 34.46125 34.46125 34.46125 ZT8-11 48.2639 48.2639 48.2639 ZT12-15 0 0 0 ZT16-19 37.814 37.814 37.814 ZT20-23 45.1559 45.1559 45.1559